What is the main purpose of engine oil?

The main purpose of engine oil is to lubricate engine components and reduce wear, making it essential for the proper functioning and longevity of the engine. The lubrication provided by engine oil forms a protective film between moving parts, minimizing friction and preventing metal-to-metal contact. This not only helps in reducing wear but also lowers the risk of overheating by dissipating heat generated during engine operation.

While other functions of engine oil may also contribute to the overall operation of an engine, such as cleaning and providing a slight cooling effect, the primary role remains focused on lubrication. Proper lubrication is crucial for maintaining engine efficiency and preventing premature failure of components. Thus, the correct answer highlights the fundamental aspect of engine oil’s role in enhancing the durability and reliability of the engine.