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* In ''VideoGame/XenobladeChroniclesX'', [[spoiler:as part of the RoboticReveal, the PlayerCharacter bleeds blue circulatory plasma when they get their arm blasted off.]]
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* In ''Series/AlteredCarbon'' synths have blue "blood", [[spoiler:it's notable when a supposed synth of Quelcrist Falconer bleeds red.]]
* ''Series/KamenRiderZeroOne'': [[AndroidsArePeopleToo Damaged]] [=HumaGear=] bleed blue fluid of unknown purpose. [[MonsterOfTheWeek Magia]], the hacked [=HumaGear=], don't bleed anything.
* ''Series/DoctorWho'': In "Tomb of the Cybermen," something that looks like shaving cream erupts from a dying Cyberman's chest-box.
* ''Series/KamenRiderZeroOne'': [[AndroidsArePeopleToo Damaged]] [=HumaGear=] bleed blue fluid of unknown purpose. [[MonsterOfTheWeek Magia]], the hacked [=HumaGear=], don't bleed anything.
* ''Series/DoctorWho'': In "Tomb of the Cybermen," something that looks like shaving cream erupts from a dying Cyberman's chest-box.
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* In ''Series/AlteredCarbon'' synths have blue "blood", [[spoiler:it's notable when a supposed synth of Quelcrist Falconer bleeds red.]]
* ''Series/DoctorWho'': In "Tomb of the Cybermen," something that looks like shaving cream erupts from a dying Cyberman's chest-box.
* ''Series/DoctorWho'': In "Tomb of the Cybermen," something that looks like shaving cream erupts from a dying Cyberman's chest-box.
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** In [[Recap/FuturamaS2E18TheHonking "The Honking"]], after Bender goes out all night as a [[OurWerewolvesAreDifferent Werecar]], he wakes the next morning laying in a a puddle with what looks like dark red blood that's splattered on his mouth. Bender identifies it as transmission fluid.
to:
** In [[Recap/FuturamaS2E18TheHonking "The Honking"]], after Bender goes out all night as a [[OurWerewolvesAreDifferent Werecar]], he wakes the next morning laying in a a puddle with what looks like dark red blood that's splattered on his mouth. Bender identifies it as transmission fluid.
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** In [[Recap/FuturamaS2E18TheHonking "The Honking"]], after Bender goes out all night as a [[OurWerewolvesAreDifferent Werecar]], he wakes the next morning laying in a a puddle with what looks like dark red blood that's splattered on his mouth. Bender identifies it as transmission fluid.
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* During the final battle of ''Film/IronMan2'', the Hammer drones spurt oil when Iron Man and War Machine blow them apart. The fight scene was choreographed by Creator/GenndyTartakovsky, who had used a similar style in ''WesternAnimation/SamuraiJack'' (see below under Western Animation).
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* ''VideoGame/AlienIsolation'': Working Joes "bleed" a milky fluid when injured like the androids from the movies however they were created by Seegson to serve as a cheaper alternative to Weyland-Yutani's androids.
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* ''VideoGame/AlienIsolation'': Working Joes "bleed" a milky fluid when injured like the androids from the movies however movies. However, they were created by Seegson to serve as a cheaper alternative to Weyland-Yutani's androids.
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This may be an android's [[RoboticReveal reveal]], confirming it's not biologically human. In other cases it may not reveal anything - if it's not confirmed whether the AmbiguousRobots are bleeding or leaking, it only makes them more ambiguous.
to:
This may be an android's [[RoboticReveal reveal]], RoboticReveal, confirming it's not biologically human. In other cases it may not reveal anything - if it's not confirmed whether the AmbiguousRobots are bleeding or leaking, it only makes them more ambiguous.
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* In ''Anime/NeonGenesisEvangelion'', the robots ([[spoiler:well, bio-engineered giant cyborgs encased in PoweredArmor]]) [[HighPressureBlood bleed lots and lots of red]]
to:
* In ''Anime/NeonGenesisEvangelion'', the robots ([[spoiler:well, bio-engineered giant cyborgs encased in PoweredArmor]]) titular HumongousMecha fight hand-to-hand with monsters strong enough to pierce their armor or even sever their limbs. When this happens, the Evangelions bleed - [[HighPressureBlood a lot]]. Unit 01 bleeds red, the others bleed lots and lots blue. This is because an Evangelion [[spoiler: is not a robot, but a genetically-engineered {{Cyborg}} EldritchAbomination encased in PoweredArmor]].
** When they are not in operation, the Evangelions are stored not in a conventional hangar or drydock, but in a giant tank ofred]]water. This peaceful bath doesn't suggest violence the way blood does - instead it is reminiscent of amniotic fluid in a womb. It adds to the Evas' appearance as AmbiguousRobots.
** When they are not in operation, the Evangelions are stored not in a conventional hangar or drydock, but in a giant tank of
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* The Geth in ''VideoGame/MassEffect'' bleed a white fluid when shot.
* Oil platters on the player’s helmet when melee killing a battle droid in ''VideoGame/StarWarsRepublicCommando''. Fortunately, clone commandos have the Star Wars equivalent to windshield wipers built in.
* Oil platters on the player’s helmet when melee killing a battle droid in ''VideoGame/StarWarsRepublicCommando''. Fortunately, clone commandos have the Star Wars equivalent to windshield wipers built in.
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In works centered around or containing robots, vehicles, MechanicalLifeforms androids, machines, mecha, etc., creators add a human element to the artificially created beings to set the tone and so that the audience will have an easier time relating to the characters. Using oil, hydraulic fluid or some type of unusually colored fluid as a stand in for blood makes things look a lot more serious and exciting in action scenes and can also makes the audience more sympathetic if the "bleeding" robot is one of the protagonists or a tragic character.
In some works, the fluid is red and pretty much indistinguishable from actual blood. In others, it really ''is'' blood and the mechanical life forms are RidiculouslyHumanRobots.
The trope is also used to [[RoboticReveal reveal]] an android's not so human nature.
In some works, the fluid is red and pretty much indistinguishable from actual blood. In others, it really ''is'' blood and the mechanical life forms are RidiculouslyHumanRobots.
The trope is also used to [[RoboticReveal reveal]] an android's not so human nature.
to:
In works centered around or containing robots, vehicles, MechanicalLifeforms androids, machines, mecha, etc., creators add a human element to the artificially created beings to set the tone and so that the audience will have an easier time relating to the characters. Using oil, coolant, battery acid, hydraulic fluid or some type of unusually colored fluid liquid as a stand in stand-in for blood makes things look a lot more serious and exciting visceral in action scenes and can scenes. It also makes the audience more sympathetic if the "bleeding" robot is one of the protagonists or a tragic character.
In some works, the fluid is red andpretty much indistinguishable visually-indistinguishable from actual blood. In others, it really ''is'' artificial blood and the mechanical life forms are RidiculouslyHumanRobots.
The trope is also used to [[RoboticReveal reveal]] This may be an android's [[RoboticReveal reveal]], confirming it's not so human nature.
biologically human. In other cases it may not reveal anything - if it's not confirmed whether the AmbiguousRobots are bleeding or leaking, it only makes them more ambiguous.
In some works, the fluid is red and
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* ''Series/DoctorWho'': In "Tomb of the Cybermen," something that looks like shaving cream erupts from a dying Cyberman's chest-box.
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* ''Fanfic/MegaManDefenderOfTheHumanRace'' sometimes uses oil as an analogy for blood. One of the biggest instances is at the end of Episode 11 [[spoiler:after Mega Man's severe damage from the Mad Grinder, with Dr. Light hooking up an oil feed tube in a manner akin to a blood transfusion and Proto Man looking at how his own hands and chest were stained as he carried Mega Man to safety.]]
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* In ''Series/AlteredCarbon'' synths have blue "blood", [[spoiler: it's notable when a supposed synth of Quelcrist Falconer bleeds red.]]
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* In ''Series/AlteredCarbon'' synths have blue "blood", [[spoiler: it's [[spoiler:it's notable when a supposed synth of Quelcrist Falconer bleeds red.]]
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** ''VideoGame/MegaManX4'': Red liquid gushes out from the Maverick Hunter HQ reploids when they are cut into pieces by [[spoiler: Double's battle mode]].
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** ''VideoGame/MegaManX4'': Red liquid gushes out from the Maverick Hunter HQ reploids when they are cut into pieces by [[spoiler: Double's [[spoiler:Double's battle mode]].
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adding example
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* ''Anime/BravePoliceJDecker'': There's an episode where Deckerd goes off on his own to find the criminals and is shot multiple times, leaking blood-like fluids from all his holes even [[BloodFromTheMouth from his mouth]] and unable to get up and walk. [[IAintGotTimeToBleed He's fine]] almost immediately after [[ThePowerOfFriendship his friends show up to save him]].
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* Bolt in ''VideoGame/{{Paladins}}'' bleeds oil when shot at.
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* In the sci-fi film ''Time Under Fire'', the androids bleed mercury.
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->"''If you prick me, do I not...leak?''"
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->"''If you prick me, do I not... leak?''"
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[[folder:Fanfic]]
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[[folder:Film -- Animation]]
* When the Lemons blow up Rod "Torque" Redline in ''WesternAnimation/{{Cars 2}}'', we actually see a puddle of oil trickle under the Lemons' tires once Redline is finally dead.
* When the Lemons blow up Rod "Torque" Redline in ''WesternAnimation/{{Cars 2}}'', we actually see a puddle of oil trickle under the Lemons' tires once Redline is finally dead.
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* When the Lemons blow up Rod "Torque" Redline in
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[[folder:Film -- Live-Action]]
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[[folder:Webcomics]]
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[[/folder]]
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* In ''Series/AlteredCarbon'' synths have blue "blood", [[spoiler: it's notable when a supposed synth of Quelcrist Falconer bleeds red.]]
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An inverse Robotic Reveal is a trope in of itself
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* In ''VideoGame/MetalGearRisingRevengeance'' red blood and white "blood" are used to distinguish cyborgs/droids and unmodified humans. [[spoiler:Jetstream Sam's boss fight]] ends with a sort of inverted RoboticReveal, where the fact they bleed red is used to show that they have very few cyborg parts. At least in regions where the red blood isn't censored.
to:
* In ''VideoGame/MetalGearRisingRevengeance'' red blood and white "blood" are used to distinguish cyborgs/droids and unmodified humans. [[spoiler:Jetstream Sam's boss fight]] ends with a sort of inverted RoboticReveal, an UnroboticReveal, where the fact they bleed red is used to show that they have very few cyborg parts. At least in regions where the red blood isn't censored.
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* In ''VideoGame/PeoplePlayground'', androids bleed brown oil while humans bleed red blood.
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** Riddhe's Delta Plus bleeds the same in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
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** Riddhe's Delta Plus bleeds the same way in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
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it's recommended to avoid spoiler tags in cases where it would be obvious what's under the cut (such as a very short space hiding the only character name in the film that short)
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* The androids in the ''Franchise/{{Alien}}'' films "bleed" a milky fluid when injured. Since these are also RidiculouslyHumanRobots, it works as a RoboticReveal in the [[Film/{{Alien}} first film]], when [[spoiler: Ash]] bleeds white from a cut.
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* The androids in the ''Franchise/{{Alien}}'' films "bleed" a milky fluid when injured. Since these are also RidiculouslyHumanRobots, it works as a RoboticReveal in the [[Film/{{Alien}} first film]], when [[spoiler: Ash]] one character bleeds white from a cut.
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the helicopter is not a character
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* ''Film/TheMatrix''. As Neo, Trinity and Morpheus are escaping in a helicopter, Agent Smith shoots the copter with his pistol twice. A liquid (presumably oil) starts spraying out of the holes at high speed and warning lights and alarms go off inside the copter. The helicopter goes out of control and crashes into a building.
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* ''TabletopGame/{{Pathfinder}}'': Androids, artificial humanoids who very closely resemble humans but are made out of synthetic materials, utilize a colorless mixture of coolant fluids and nanomachines as "blood".
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* ''TabletopGame/{{Pathfinder}}'': Androids, artificial humanoids who very closely resemble humans but are made out of synthetic materials, utilize a colorless mixture of coolant fluids and nanomachines as "blood". Due to this, they're as vulnerable as humanoids are to ''[[StandardStatusEffects bleed]]'' effects, unlike pure Constructs.
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* ''Manga/MahouSenseiNegima'' has this when [[spoiler:the fourth form of Fate, Quartum appears to promptly slash Chachamaru in half at the mid-section, leaving her bleeding and [[TearsOfBlood crying]] fluids all over the deck of the Great Paru-sama, implying that she's powered by hydraulics]].
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wrong section
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* ''Series/StargateSG1'': In "[[Recap/StargateSG1S1E18TinMan Tin Man]]", SG-1 first realize they've been turned into robots when Dr. Fraiser goes to draw blood from Jack and instead gets something that looks like white lithium grease.
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* ''Series/StargateSG1'': In "[[Recap/StargateSG1S1E18TinMan Tin Man]]", SG-1 first realize they've been turned into robots when Dr. Fraiser goes to draw blood from Jack and instead gets something that looks like white lithium grease.
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* ''Series/StargateSG1'': In "[[Recap/StargateSG1S1E18TinMan Tin Man]]", SG-1 first realize they've been turned into robots when Dr. Fraiser goes to draw blood from Jack and instead gets something that looks like white lithium grease.
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* ''Videogame/BlazBlue:'' Tager, a huge cyborg, has his blood type listed as "natural oil".
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** Riddhe's Delta Plus does the same in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
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** Riddhe's Delta Plus does bleeds the same in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
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!Robot blood is being split from SymbolicBlood as per this [[https://tvtropes.org/pmwiki/posts.php?discussion=1550773350017542200&page=2#comment-34 TRS thread]]. I am currently moving examples from SB to this trope.
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!Robot blood is being split from SymbolicBlood as per this [[https://tvtropes.org/pmwiki/posts.php?discussion=1550773350017542200&page=2#comment-34 TRS thread]]. I am currently moving examples from SB to this trope.
[[quoteright:350:[[WesternAnimation/{{Futurama}} https://static.tvtropes.org/pmwiki/pub/images/bender_oil_blood.png]]]]
->"''If you prick me, do I not...leak?''"
-->--'''Data''', ''Series/StarTrekTheNextGeneration'', "The Naked Now"
In works centered around or containing robots, vehicles, MechanicalLifeforms androids, machines, mecha, etc., creators add a human element to the artificially created beings to set the tone and so that the audience will have an easier time relating to the characters. Using oil, hydraulic fluid or some type of unusually colored fluid as a stand in for blood makes things look a lot more serious and exciting in action scenes and can also makes the audience more sympathetic if the "bleeding" robot is one of the protagonists or a tragic character.
In some works, the fluid is red and pretty much indistinguishable from actual blood. In others, it really ''is'' blood and the mechanical life forms are RidiculouslyHumanRobots.
The trope is also used to [[RoboticReveal reveal]] an android's not so human nature.
Sometimes used as a way to pass the censors in G and PG rated works where real blood, especially excessive blood, is considered inappropriate for younger audiences. If the fluid looks too much like blood in a work that was originally from a foreign country, some regional localizations are likely to either change it to look like regular oil or just edit out the blood completely.
WhatMeasureIsANonHuman is at play as people are generally more comfortable with robots/machine character "bleeding" than human characters as long as their blood doesn't look human.
See also AlienBlood, where aliens have weirdly colored blood and SymbolicBlood, where something else is used in place of blood either for comedy or for symbolism.
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[[foldercontrol]]
[[folder:Anime & Manga]]
* Most of the Boomers in ''Anime/BubblegumCrisis'' tended to bleed bright orange fluid when damaged, which is unusual for robotic enemies.
* In ''Anime/DragonBallZ'', Android 19, Android 20/Dr. Gero, and Android 16 leaked red oil when damaged. Vegeta even notices this with 19. It comes so close to looking like actual blood that some of it was removed in the edited version.
* In ''Franchise/GhostInTheShell'' whenever an android got severely damaged, white artificial blood would splatter all over the place.
* ''Franchise/{{Gundam}}'':
** In ''[[Anime/MobileSuitGundamThe08thMSTeam 08th MSTeam]]'', the battle between Norris and the Team has this when Norris stabs a guntank, resulting in a massive gout of oil being sprayed across his mobile suit.
** Riddhe's Delta Plus does the same in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
* In ''Anime/NeonGenesisEvangelion'', the robots ([[spoiler:well, bio-engineered giant cyborgs encased in PoweredArmor]]) [[HighPressureBlood bleed lots and lots of red]]
* ''Anime/ShippuIronLeaguer'': When injured, the Iron Leaguers bleed oil. Nonetheless, it looks painful enough to make the viewers cringe.
[[/folder]]
[[folder:Comic Books]]
* {{Invoked|Trope}} in one issue of ''ComicBook/TheTransformers'' when Blaster discovers a puddle of leaked Transformer fuel and, after verifying that's what it is, calls it "the lifeblood of my people".
[[/folder]]
[[folder:Fanfic]]
* ''Fanfic/DungeonKeeperAmi'': Ami's ice golems are humanoid, and, when damaged, "bleed" water, which, when covered in a glamour a.k.a illusion, to appear human, actually becomes the blood.
[[/folder]]
[[folder:Film -- Animation]]
* When the Lemons blow up Rod "Torque" Redline in ''WesternAnimation/{{Cars 2}}'', we actually see a puddle of oil trickle under the Lemons' tires once Redline is finally dead.
* ''WesternAnimation/TheBraveLittleToaster'': After Elmo St. Peters takes out the motor in his (anthromorphic) blender, electrical fluid is seen dripping from the table to the floor.
[[/folder]]
[[folder:Film -- Live-Action]]
* The androids in the ''Franchise/{{Alien}}'' films "bleed" a milky fluid when injured. Since these are also RidiculouslyHumanRobots, it works as a RoboticReveal in the [[Film/{{Alien}} first film]], when [[spoiler: Ash]] bleeds white from a cut.
* ''Film/IRobot'': When Sonny is shot in his introduction, he begins leaking some kind of liquid metal from the damaged hoses. Apparently, in 2035, they're using Osmium in their hydraulics.
* ''Film/TheMatrix''. As Neo, Trinity and Morpheus are escaping in a helicopter, Agent Smith shoots the copter with his pistol twice. A liquid (presumably oil) starts spraying out of the holes at high speed and warning lights and alarms go off inside the copter. The helicopter goes out of control and crashes into a building.
* In ''Film/ShortCircuit2'', Johnny 5 is leaking battery fluid after being damaged by the villains. His friend Ben outright says he's bleeding to death, and he even applies a makeshift tourniquet.
* In the ''[[Film/TransformersFilmSeries Transformers]]'' movies, blood from the bots is represented in some cases by fluorescent blue liquid ([[{{Fanon}} which the fandom believes is Energon]]).
* ''Film/WildWildWest''. While Dr. Loveless is riding his spider robot inside his giant SpiderTank, Artemus Gordon shoots the robot in one of its legs. A spray of liquid (presumably hydraulic fluid) sprays out of it like HighPressureBlood, and the robot slowly collapses to the deck.
[[/folder]]
[[folder:Live-Action TV]]
* In ''Series/RobotCombatLeague'', the robot fighters sometimes get so damaged, they spray hydraulic fluid everywhere. Without hydraulic fluid, the robots' limbs won't work properly, essentially paralyzing the limbs and leaving the robot at a disadvantage.
* In ''Series/StarTrekTheNextGeneration'', Data and Lore the androids have a liquid in them to lubricate their mechanics, so if one was to "injure" one of them in the right place, this liquid will leak out, which has been likened to bleeding. In addition, if one was to put their hand on Data or Lore's wrist, they would feel the lubricant oozing through in a manner similar.
[[/folder]]
[[folder:Tabletop Games]]
* ''TabletopGame/ArsMagica'': A [[{{Golem}} Hermetic automaton]]'s "blood" is its ''impetus'', an animated fluid that drives its body and fuels some of its special powers. This can be anything from various {{alchem|yIsMagic}}ical solutions to purified mercury to liquid fire, with more refined materials allowing for a more powerful automaton.
* ''TabletopGame/{{Pathfinder}}'': Androids, artificial humanoids who very closely resemble humans but are made out of synthetic materials, utilize a colorless mixture of coolant fluids and nanomachines as "blood".
[[/folder]]
[[folder:Video Games]]
* ''VideoGame/AlienIsolation'': Working Joes "bleed" a milky fluid when injured like the androids from the movies however they were created by Seegson to serve as a cheaper alternative to Weyland-Yutani's androids.
* ''VideoGame/BanjoTooie'': Mingy Jongo has green fluid, possibly either motor oil or coolant, spewing out of his neck when his head falls off after he is defeated by Banjo and Kazooie.
* ''VideoGame/DetroitBecomeHuman'': Thirium, colloquially, the "blue blood" of androids, that they need to function.
* ''Franchise/MegaMan''
** ''VideoGame/MegaManX4'': Red liquid gushes out from the Maverick Hunter HQ reploids when they are cut into pieces by [[spoiler: Double's battle mode]].
** In the Japanese ''[[VideoGame/MegamanZero Rockman Zero]]'' series, robots give out a spray of red oil when killed with the saber. This is censored in the American ''VideoGame/MegaManZero'' localizations.
* The robot/cyborg characters from ''Franchise/MortalKombat'' would have their "blood" coloured black or blue as if it were oil being knocked out from the uppercut.
*In ''VideoGame/MetalGearRisingRevengeance'' red blood and white "blood" are used to distinguish cyborgs/droids and unmodified humans. [[spoiler:Jetstream Sam's boss fight]] ends with a sort of inverted RoboticReveal, where the fact they bleed red is used to show that they have very few cyborg parts. At least in regions where the red blood isn't censored.
* In ''VideoGame/MetalGearSolid2'', the Metal Gear Rays which Raiden fights near the end bleed a white fluid, which serves a similar role to blood in their self repair systems.
* Alien-made Machine Lifeforms in ''VideoGame/NierAutomata'' "bleed" oil when you damage them, as do the human-constructed androids. [[spoiler:This is an early hint that they are built upon the same technology.]]
* ''VideoGame/{{Nanobreaker}}'' had various robot/cyborg enemies, and a menu where you could decide what of wide range of colors of "blood" they would bleed as you viciously dispatch them with your shapeshifting sword. For great humor, select the "random" option, and turn your battlefield into a particularly colorful impressionistic painting!
* Used for censorship in ''VideoGame/TeamFortress2'''s ''Meet The Soldier'' animated short. In the original, there is a lot of blood and gore, but in the German version, the blood is replaced with oil, the bones are replaced with springs, and the gore is replaced with miscellaneous items like rubber ducks, cogs, etc., implying that all the mercenaries are robots.
[[/folder]]
[[folder:Visual Novels]]
* In ''VisualNovel/Danganronpa2GoodbyeDespair'', [[spoiler:Mechamaru]] bleeds oil after being murdered. Similar to how [[BlackBlood blood is colored pink]], the oil is colored light blue.
[[/folder]]
[[folder:Webcomics]]
* ''Webcomic/StrangeSchool'': The robotic Students 'bleed' black machine oil when injured.
[[/folder]]
[[folder:Western Animation]]
* ''WesternAnimation/DinoTrux'': The only two instances of a Dinotrux suffering an injury that causes them to "bleed" are "Sawmetradon" where the titular Splitter cuts open one of Ty's oil lines with his saws and "Downshift", where Dozer blows a gasket fighting D-Structs and leaks coolant. The former is treated more like blood as Revvit immediately calls for a retreat to repair the wound stressing that Ty could suffer engine failure if allowed to bleed out.
* In ''WesternAnimation/{{Futurama}}'' episode "[[Recap/FuturamaS6E14TheSilenceOfTheClamps The Silence of the Clamps]]", a farmbot who looks like Bender is mistakenly shot to death by Bender's PsychoExGirlfriend. Instead of blood, the dying robot is bleeding oil [[BloodFromTheMouth from his mouth]].
* Robots in ''WesternAnimation/SamuraiJack'' spray oil as if it were HighPressureBlood. WordOfGod says this was done so they could include violent, high-octane action sequences in the style of old-school samurai movies but still be age appropriate for a TV-PG show.
* ''Transformers: WesternAnimation/BeastWars'': when some bot got hit, bits of metal and hydraulic fluid go ''everywhere''.
* In ''WesternAnimation/TransformersPrime'' all the 'bots "bleed" Energon. A lot. Sometimes they're even shown lying in a pool of it while near death.
[[/folder]]
[[quoteright:350:[[WesternAnimation/{{Futurama}} https://static.tvtropes.org/pmwiki/pub/images/bender_oil_blood.png]]]]
->"''If you prick me, do I not...leak?''"
-->--'''Data''', ''Series/StarTrekTheNextGeneration'', "The Naked Now"
In works centered around or containing robots, vehicles, MechanicalLifeforms androids, machines, mecha, etc., creators add a human element to the artificially created beings to set the tone and so that the audience will have an easier time relating to the characters. Using oil, hydraulic fluid or some type of unusually colored fluid as a stand in for blood makes things look a lot more serious and exciting in action scenes and can also makes the audience more sympathetic if the "bleeding" robot is one of the protagonists or a tragic character.
In some works, the fluid is red and pretty much indistinguishable from actual blood. In others, it really ''is'' blood and the mechanical life forms are RidiculouslyHumanRobots.
The trope is also used to [[RoboticReveal reveal]] an android's not so human nature.
Sometimes used as a way to pass the censors in G and PG rated works where real blood, especially excessive blood, is considered inappropriate for younger audiences. If the fluid looks too much like blood in a work that was originally from a foreign country, some regional localizations are likely to either change it to look like regular oil or just edit out the blood completely.
WhatMeasureIsANonHuman is at play as people are generally more comfortable with robots/machine character "bleeding" than human characters as long as their blood doesn't look human.
See also AlienBlood, where aliens have weirdly colored blood and SymbolicBlood, where something else is used in place of blood either for comedy or for symbolism.
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[[foldercontrol]]
[[folder:Anime & Manga]]
* Most of the Boomers in ''Anime/BubblegumCrisis'' tended to bleed bright orange fluid when damaged, which is unusual for robotic enemies.
* In ''Anime/DragonBallZ'', Android 19, Android 20/Dr. Gero, and Android 16 leaked red oil when damaged. Vegeta even notices this with 19. It comes so close to looking like actual blood that some of it was removed in the edited version.
* In ''Franchise/GhostInTheShell'' whenever an android got severely damaged, white artificial blood would splatter all over the place.
* ''Franchise/{{Gundam}}'':
** In ''[[Anime/MobileSuitGundamThe08thMSTeam 08th MSTeam]]'', the battle between Norris and the Team has this when Norris stabs a guntank, resulting in a massive gout of oil being sprayed across his mobile suit.
** Riddhe's Delta Plus does the same in ''Anime/MobileSuitGundamUnicorn'', when [[spoiler:the Banshee destroys it]].
* In ''Anime/NeonGenesisEvangelion'', the robots ([[spoiler:well, bio-engineered giant cyborgs encased in PoweredArmor]]) [[HighPressureBlood bleed lots and lots of red]]
* ''Anime/ShippuIronLeaguer'': When injured, the Iron Leaguers bleed oil. Nonetheless, it looks painful enough to make the viewers cringe.
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[[folder:Comic Books]]
* {{Invoked|Trope}} in one issue of ''ComicBook/TheTransformers'' when Blaster discovers a puddle of leaked Transformer fuel and, after verifying that's what it is, calls it "the lifeblood of my people".
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[[folder:Fanfic]]
* ''Fanfic/DungeonKeeperAmi'': Ami's ice golems are humanoid, and, when damaged, "bleed" water, which, when covered in a glamour a.k.a illusion, to appear human, actually becomes the blood.
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[[folder:Film -- Animation]]
* When the Lemons blow up Rod "Torque" Redline in ''WesternAnimation/{{Cars 2}}'', we actually see a puddle of oil trickle under the Lemons' tires once Redline is finally dead.
* ''WesternAnimation/TheBraveLittleToaster'': After Elmo St. Peters takes out the motor in his (anthromorphic) blender, electrical fluid is seen dripping from the table to the floor.
[[/folder]]
[[folder:Film -- Live-Action]]
* The androids in the ''Franchise/{{Alien}}'' films "bleed" a milky fluid when injured. Since these are also RidiculouslyHumanRobots, it works as a RoboticReveal in the [[Film/{{Alien}} first film]], when [[spoiler: Ash]] bleeds white from a cut.
* ''Film/IRobot'': When Sonny is shot in his introduction, he begins leaking some kind of liquid metal from the damaged hoses. Apparently, in 2035, they're using Osmium in their hydraulics.
* ''Film/TheMatrix''. As Neo, Trinity and Morpheus are escaping in a helicopter, Agent Smith shoots the copter with his pistol twice. A liquid (presumably oil) starts spraying out of the holes at high speed and warning lights and alarms go off inside the copter. The helicopter goes out of control and crashes into a building.
* In ''Film/ShortCircuit2'', Johnny 5 is leaking battery fluid after being damaged by the villains. His friend Ben outright says he's bleeding to death, and he even applies a makeshift tourniquet.
* In the ''[[Film/TransformersFilmSeries Transformers]]'' movies, blood from the bots is represented in some cases by fluorescent blue liquid ([[{{Fanon}} which the fandom believes is Energon]]).
* ''Film/WildWildWest''. While Dr. Loveless is riding his spider robot inside his giant SpiderTank, Artemus Gordon shoots the robot in one of its legs. A spray of liquid (presumably hydraulic fluid) sprays out of it like HighPressureBlood, and the robot slowly collapses to the deck.
[[/folder]]
[[folder:Live-Action TV]]
* In ''Series/RobotCombatLeague'', the robot fighters sometimes get so damaged, they spray hydraulic fluid everywhere. Without hydraulic fluid, the robots' limbs won't work properly, essentially paralyzing the limbs and leaving the robot at a disadvantage.
* In ''Series/StarTrekTheNextGeneration'', Data and Lore the androids have a liquid in them to lubricate their mechanics, so if one was to "injure" one of them in the right place, this liquid will leak out, which has been likened to bleeding. In addition, if one was to put their hand on Data or Lore's wrist, they would feel the lubricant oozing through in a manner similar.
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[[folder:Tabletop Games]]
* ''TabletopGame/ArsMagica'': A [[{{Golem}} Hermetic automaton]]'s "blood" is its ''impetus'', an animated fluid that drives its body and fuels some of its special powers. This can be anything from various {{alchem|yIsMagic}}ical solutions to purified mercury to liquid fire, with more refined materials allowing for a more powerful automaton.
* ''TabletopGame/{{Pathfinder}}'': Androids, artificial humanoids who very closely resemble humans but are made out of synthetic materials, utilize a colorless mixture of coolant fluids and nanomachines as "blood".
[[/folder]]
[[folder:Video Games]]
* ''VideoGame/AlienIsolation'': Working Joes "bleed" a milky fluid when injured like the androids from the movies however they were created by Seegson to serve as a cheaper alternative to Weyland-Yutani's androids.
* ''VideoGame/BanjoTooie'': Mingy Jongo has green fluid, possibly either motor oil or coolant, spewing out of his neck when his head falls off after he is defeated by Banjo and Kazooie.
* ''VideoGame/DetroitBecomeHuman'': Thirium, colloquially, the "blue blood" of androids, that they need to function.
* ''Franchise/MegaMan''
** ''VideoGame/MegaManX4'': Red liquid gushes out from the Maverick Hunter HQ reploids when they are cut into pieces by [[spoiler: Double's battle mode]].
** In the Japanese ''[[VideoGame/MegamanZero Rockman Zero]]'' series, robots give out a spray of red oil when killed with the saber. This is censored in the American ''VideoGame/MegaManZero'' localizations.
* The robot/cyborg characters from ''Franchise/MortalKombat'' would have their "blood" coloured black or blue as if it were oil being knocked out from the uppercut.
*In ''VideoGame/MetalGearRisingRevengeance'' red blood and white "blood" are used to distinguish cyborgs/droids and unmodified humans. [[spoiler:Jetstream Sam's boss fight]] ends with a sort of inverted RoboticReveal, where the fact they bleed red is used to show that they have very few cyborg parts. At least in regions where the red blood isn't censored.
* In ''VideoGame/MetalGearSolid2'', the Metal Gear Rays which Raiden fights near the end bleed a white fluid, which serves a similar role to blood in their self repair systems.
* Alien-made Machine Lifeforms in ''VideoGame/NierAutomata'' "bleed" oil when you damage them, as do the human-constructed androids. [[spoiler:This is an early hint that they are built upon the same technology.]]
* ''VideoGame/{{Nanobreaker}}'' had various robot/cyborg enemies, and a menu where you could decide what of wide range of colors of "blood" they would bleed as you viciously dispatch them with your shapeshifting sword. For great humor, select the "random" option, and turn your battlefield into a particularly colorful impressionistic painting!
* Used for censorship in ''VideoGame/TeamFortress2'''s ''Meet The Soldier'' animated short. In the original, there is a lot of blood and gore, but in the German version, the blood is replaced with oil, the bones are replaced with springs, and the gore is replaced with miscellaneous items like rubber ducks, cogs, etc., implying that all the mercenaries are robots.
[[/folder]]
[[folder:Visual Novels]]
* In ''VisualNovel/Danganronpa2GoodbyeDespair'', [[spoiler:Mechamaru]] bleeds oil after being murdered. Similar to how [[BlackBlood blood is colored pink]], the oil is colored light blue.
[[/folder]]
[[folder:Webcomics]]
* ''Webcomic/StrangeSchool'': The robotic Students 'bleed' black machine oil when injured.
[[/folder]]
[[folder:Western Animation]]
* ''WesternAnimation/DinoTrux'': The only two instances of a Dinotrux suffering an injury that causes them to "bleed" are "Sawmetradon" where the titular Splitter cuts open one of Ty's oil lines with his saws and "Downshift", where Dozer blows a gasket fighting D-Structs and leaks coolant. The former is treated more like blood as Revvit immediately calls for a retreat to repair the wound stressing that Ty could suffer engine failure if allowed to bleed out.
* In ''WesternAnimation/{{Futurama}}'' episode "[[Recap/FuturamaS6E14TheSilenceOfTheClamps The Silence of the Clamps]]", a farmbot who looks like Bender is mistakenly shot to death by Bender's PsychoExGirlfriend. Instead of blood, the dying robot is bleeding oil [[BloodFromTheMouth from his mouth]].
* Robots in ''WesternAnimation/SamuraiJack'' spray oil as if it were HighPressureBlood. WordOfGod says this was done so they could include violent, high-octane action sequences in the style of old-school samurai movies but still be age appropriate for a TV-PG show.
* ''Transformers: WesternAnimation/BeastWars'': when some bot got hit, bits of metal and hydraulic fluid go ''everywhere''.
* In ''WesternAnimation/TransformersPrime'' all the 'bots "bleed" Energon. A lot. Sometimes they're even shown lying in a pool of it while near death.
[[/folder]]
