Correct answer
Reduce friction between moving parts.
Its main function is to reduce friction by forming an oil film between moving parts. This reduces wear and the risk of seizure. Oil also helps remove some engine heat: this is another real lubrication function, although it does not fully replace the cooling system. Lubrication reduces friction rather than eliminating all friction.
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Transmit engine power to the driven wheel.
Fully replace the engine cooling system.
Reduce friction between moving parts.
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