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.

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Fiction

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