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Q: Gradual psi oil drop from 40/0.Oil lvl gd,no warning lights. on 2003 Chevrolet Silverado 2500 HD

Just recently I've noticed oil psi drp aft driving 40mi.Turning the engine off & restart brings pressure back up but will drp aft 10mi. Engine runs smooth @ idle and when given gas. No warning lights come on.
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You need to check your oil pressure with a gauge...good oil pressure = bad sensor; bad oil pressure = possible oil pump issue...
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