What is the function of oil within an engine?

The primary function of oil within an engine is to lubricate moving parts. This lubrication is essential for reducing friction between components that are in constant motion, such as the pistons, crankshaft, and camshaft. By forming a film between these surfaces, oil helps prevent wear and tear, which prolongs the life of the engine.

Additionally, it's important to note that while oil does assist in some cooling and cleaning processes, its main role is lubrication. The oil helps to absorb heat generated by the engine's operation and can carry contaminants away, but it is not specifically designed to serve as a cooling system or a cleaner. There are dedicated systems within an engine, such as the cooling system and oil filters, that handle those functions more effectively.

The idea of oil igniting the fuel is also a misconception; ignition of the fuel is a separate process involving the air-fuel mixture and spark plugs or compression. Therefore, the accurate understanding of oil's primary function emphasizes its role in lubrication.