What does an engine's lubrication system primarily help with?

An engine's lubrication system is primarily designed to reduce friction between moving parts, allowing them to operate smoothly and efficiently. By providing a continuous supply of oil, it aids in minimizing wear and tear on those parts, enhancing the overall performance and longevity of the engine.

Although it may seem that the lubrication system might contribute to cooling and cleaning, those functions are secondary effects rather than primary purposes. The actual role of cooling is primarily managed by the engine's cooling system, which uses coolant to dissipate heat. Regarding cleaning, while oil can carry away some contaminants and particulates, the primary function of the lubrication system isn't cleaning but rather ensuring proper lubrication.

Thus, the main focus of an engine's lubrication system is to reduce friction, and the other functions are auxiliary rather than its primary purpose.