What is the primary purpose of engine oil?

The primary purpose of engine oil is to reduce friction between the moving parts of an engine. Engine components, such as pistons, crankshafts, and camshafts, operate at high speeds and generate significant heat due to the friction that occurs during movement. Lubrication provided by engine oil forms a protective film between these surfaces, minimizing direct contact and thereby reducing wear and tear, which can lead to engine damage over time.

By effectively reducing friction, engine oil not only prolongs the life of the engine but also helps it operate more efficiently, resulting in better performance and fuel economy. In addition, well-lubricated components perform better, enhancing the overall reliability of the engine. While engine oil also has other functions, such as cooling and cleaning, its main role centers on reducing friction to ensure smooth engine operation.