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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4 answers
do a manual oil pressure test and if good repl oil sending unit
Yikes! maybe your sensor is bad or your oil pump is losing pressure
You need to check your oil pressure with a gauge...good oil pressure = bad sensor; bad oil pressure = possible oil pump issue...
Pick-up screen in sump is possibly clogged. R&R oil pan & clean or replace.