What is the primary function of the engine oil pump?

The primary function of the engine oil pump is to circulate oil through the engine. This circulation is crucial because it ensures that all moving parts of the engine receive adequate lubrication, which reduces friction and wear, helping to prolong the engine's life. The oil pump takes oil from the oil pan and pumps it through various channels and galleries to reach critical engine components such as bearings, camshaft, and piston rings. This continuous flow of oil not only lubricates the components but also helps carry away heat, contributing to the overall efficiency of engine function.

While filtration, cooling, and measuring oil temperature are important aspects of engine maintenance and performance, they are not the primary role of the oil pump itself. The oil filter does the job of filtering contaminants from the oil, oil coolers are responsible for dissipating heat, and separate sensors or gauges measure oil temperature. Therefore, the correct answer focuses specifically on the oil pump's critical task of ensuring oil circulation throughout the engine.