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hello, this is common in high mileage engines due to worn crank bearing clearances etc.., heated oil is thinner than cold oil and flows easier ---- thus pressure drop, try a thicker oil and you'll keep the pressure high a little longer but eventually the only solution is to replace the worn engine

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Q: What would cause a 96 2.2 Chevy S-10 to lose oil pressure after replacing the oil pump After the truck runs for a few minutes the oil pressure drops?
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