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A bad oil pump will casue no oil pressure and/or a bad oil filter Answer #2: If the oil pressure is up when the engine is cold but drops after the engine warms a bit, the bearings are worn and the oil pump is not engineered to pump enough volume to keep the pressure up once the bearing tolerances get that worn. Try using a heavier grade oil. If you have been using a 5 W 15 oil, go to a 10 W 30. If you've been using 10 W 30 try a 15 W 40. If that doesn't work try an oil thickener. You might be able to squeeze a little more service out of a failing engine if you have a thicker weight oil. If the oil pressure is up when the oil is cool, it's not the oil pump. pressure sending unit

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โˆ™ 2006-03-31 19:12:52
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Q: What causes an oil pressure reading of nearly zero after engine warms up Chevy 350 doesnt leak or burn oil?
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