Oil
Oil is a generic term for a slippery liquid that won't mix readily with water. Oils vary widely in composition but generally consist of mixed organic compounds.
Oils find frequent use as lubricants, fuels, and solvents. Transformers are among the users of oils in these capacities; however, they sometimes consume certain oily substances in larger quantities than strictly required, resulting in impairment of certain functions, disorientation, and temporary mental dysfunction. Though at first it may seem odd, some actively seek these seemingly-deleterious effects. What is odder yet is that humans seek out and consume varying solutions of a certain hydrocarbon with a single hydroxyl group and experience effects quite similar to those mentioned above. Further study is needed to explain this strange coincidence.
Fiction
Generation 1 cartoon
The Decepticons raided an offshore rig drilling for oil, converting the oil into energon cubes. The Autobots arrived to stop them, resulting in the destruction of the rig. While the Decepticons got the Energon cubes, the Autobots managed to save the crew, and started their long friendship with the Witwicky family. MTMTE, Part 2
Marvel Comics continuity
Head on down to Maccadam's Old Oil House for a pint.
Beast Wars II cartoon
Galvatron was a violent oil-oholic, constantly over-energizing and then rampaging.
Transformers: Animated cartoon
- Bumblebee offered the phrase "Eat crankcase oil!" as an epithet, implying oil from a crankcase is considered less desirable or even unpalatable by Transformers. Home Is Where the Spark Is
- Oil is apparently the equivalent of beer or wine for Cybertronians in the Animated series. Scrapper and Mixmaster enjoy it from "pint glasses" (barrels) at the "bar" (some random tanker) after a hard day's work. Megatron, however, seems to have specially-made "goblets" for his own stash. The quality of oil could also be analogous to said human alcoholic drinks as Mixmaster says that the Autobots' oil "tastes like water" compared to Megatron's, who calls it his own "private blend". Rise of the Constructicons
- Oil also appears to be the equivalent of blood, as a Starscream clone once said to Prowl "Are you sure that you don't have some Decepticon oil in your tubes?" Also, Bumblebee once said, when dressed up as 'Count Dracu-bot' for Halloween, "I vant to drink your motor oil!" Bumblebee also bleed oil from his arm(as a oil leak), but was similar to blood dripping from a humans hand. Mixmaster and Scapper found it delicious Sari, No One's Home. The cannibalistic implications of it functioning as both blood and alcohol are slightly disturbing.
