What is the main reason for changing engine oil regularly?

Changing engine oil regularly is primarily essential for reducing friction and wear in the engine. Engine oil plays a critical role in lubricating the moving parts of an engine, which minimizes metal-to-metal contact. Over time, oil can break down due to high temperatures and contamination from particles, which affects its ability to provide adequate lubrication. If oil is not changed regularly, it can become less effective, leading to increased friction between engine components. This friction can cause faster wear and ultimately lead to engine damage or failure.

Regular oil changes ensure that the engine operates smoothly and efficiently. This maintenance practice not only prolongs the life of the engine but also helps maintain optimal performance and fuel efficiency. Therefore, the primary reason for regularly changing engine oil revolves around its vital function in reducing friction and wear, contributing to overall engine health and longevity.