What are the three primary functions of engine oil?

The three primary functions of engine oil are to cool, clean, and lubricate the engine's moving parts.

Cooling is essential because engine oil helps dissipate heat generated during combustion and friction between the engine components. This cooling effect prevents overheating and allows the engine to operate efficiently over time.

Cleaning is another crucial function of engine oil. It contains detergents and additives designed to suspend and remove contaminants, dirt, and sludge that can accumulate in the engine due to combustion byproducts. This cleaning action helps to maintain the performance of the engine and extends its lifespan by preventing wear and tear on components.

Lubrication is perhaps the most widely recognized function of engine oil. It creates a protective film between moving parts, reducing friction and wear. This lubrication minimizes metal-to-metal contact, ensuring smooth operation and helping to prevent damage from excessive heat or debris.

While the other choices touch upon processes related to engines, they do not encompass the primary roles of engine oil that directly contribute to the engine's functionality and longevity.