The purpose of the engine oil system is to provide regulated flow of filtered oil to the moving components of the engine to __________ the bearings and gears.

• A. Cool
• B. Clean
• C. Lubricate
• D. All of the above

Answer: (D)

The engine oil system plays a crucial role in maintaining the efficiency and longevity of an engine's moving components. The primary functions of the oil system encompass cooling, cleaning, and lubricating.

Lubrication is vital as it reduces friction between moving parts, which helps to prevent wear and tear. This is essential for the smooth operation of the bearings and gears within the engine. Without adequate lubrication, these parts would be prone to overheating and failure.

Additionally, the engine oil serves to cool components by dissipating heat generated during operation. By circulating oil throughout the engine, excess heat is absorbed and carried away, helping to maintain optimal operating temperatures.

The oil also acts as a cleaning agent, trapping contaminants and particulate matter that can accumulate over time. This helps prevent sludge buildup and keeps the engine components clean, further supporting efficient operation.

In summary, the engine oil system is designed to simultaneously cool, clean, and lubricate, making it essential for the reliability and performance of the engine. This multifaceted function of the oil system is why the choice indicating all of these purposes is correct.