What is the function of engine oil in a vehicle?

Engine oil serves multiple critical functions in a vehicle's engine, but one of its primary roles is to lubricate the moving parts. This lubrication is crucial because it minimizes friction between components such as pistons, crankshafts, and camshafts, allowing them to move smoothly and reducing wear and tear. This is essential for maintaining the longevity of the engine and ensuring it operates efficiently.

While engine oil does contribute to other aspects, such as helping regulate temperature and, to some degree, filtering contaminants, its fundamental purpose revolves around reducing friction and preventing damage from heat and wear. The lubrication provided by engine oil is vital for the overall health of the engine, ensuring that it runs smoothly and reliably over time.