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MY GMC Z71, 2000 model truck oil pressure always stayed on 40. now I can drive about 15 miles and the pressure drops to 20. I can stop, turn off engine and start up again & pressure is at 40 for about 15 miles then drops back to 20. What is the problem?

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1995 dodge V10 185000 miles. When you start it you don't have oil pressure and at an idle it won't go up. rev the engine 15 to 20 sec. oil pressure go up to 40 lbs. and stays there even at idle.

I would install a test mechanical gage on the engine (remove sender and install there) and see if the oil pressure really is low when it is started.

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I have a 1987 gmc suburban and the oil pressure gauge at start up reads about 35 to 40 but after driving a while will drop to 15 is oil pressure switch bad

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Oil pressue gage just started acting up when moving it stays at 40 when you stop and are idling drops just above red zone

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