Lubricant
Lubricant is a fluid contained within the body of a Transformer that is (presumably) used to make the mechanical joints of a transformer move more smoothly. Humans often use oil as lubricant.
Fiction
Marvel Comics continuity
Marvel The Transformers comics
Lubrication is useful if your jaw seizes up. Totaled!
Ladybird Books continuity
A lubricant shortage sent the Autobots searching for an underground lake of oil on Nebulos. When the Decepticons struck back, the lubricated ground caused them to crash in a heap, allowing an Autobot escape. Autobots Strike Oil
Live-action film series
Transformers film
Ironhide assumed that Sam's dog Mojo was leaking lubricant onto his foot, an offense which Ironhide was prepared to repay by turning the dog into a smoldering crater.
Much later, after Agent Simmons kidnapped Sam and the Autobots intercepted the convoy, Bumblebee displayed his disapproval by showering the hapless Sector Seven employee with lubricant. Transformers
Revenge of the Fallen film
While trying to warn Sam about Alice's true nature, Bumblebee sprayed the Decepticon with lubricant. Revenge of the Fallen
Animated cartoon
Optimus Prime once used negative-friction lubricant to stop Nanosec in his tracks. Nanosec On another occasion, Bumblebee's careless leaking of oil lubricant from his arm lead Mixmaster and Scrapper back to the base. Sari, No One's Home Bulkhead used oil's lubricating properties to free himself from Mixmaster, during another time when the Constructicons were making a nuisance of themselves. Three's a Crowd
