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Oil pressure light has almost nothing to do with with the amount of oil in the crankcase. Oil pressure is affected by just a couple things, does the oil pump work, is the pickup screen blocked, have the main and/or rod bearings worn out and does the pressure bypass still work? Rod and main bearings are quite simple, they consist of a hardened crankshaft with carefully turned and polished contact surfaces and rod and main bearings which fit tightly to the crankshaft with no more than two thousandths of an inch clearance when the bearings are new. The contact surface of the bearing is made of a very soft metal called "babbit". Oil pressur keeps the babbit bearing surface from actually coming in contact with the crankshaft surface. If the babbit has worn and the bearing surface has worn to the point that the clearance has significantly increased, the oil will leak past the bearings and the pump will not be able to pump enough oil volume to keep the pressure up. In short, low oil pressure is one of the main indicators that an engine is worn out.

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โˆ™ 2006-03-01 03:12:24
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Q: What does an oil light coming on mean when the oil is full?
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