Every engine requires a certain amount of oil flow to keep the bearings, camshaft, valvetrain and other moving parts lubricated. Oil forms a barrier that prevents metal-to-metal contact and reduces friction and wear. In the bearings, it forms a wedge that actually lifts and supports the crankshaft and camshaft as they rotate.
Oil also serves as the primary means of cooling the bearings as well as the pistons. What's more, oil also serves as a hydraulic fluid inside...​
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