what is the correct oil pressure reading at idle for 2001 gmc sierra 2500hd 6 liter gas engine
Depends on the oil temperature, oil condition and your motor. Clean good oil when cold should be well above 30 psi. As your engine warms up the pressure will drop but at 25 or above is a good baseline. The are issues with the oil pumps and internal pressure regulators, what are you reading when cold and warm?
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