Gradual psi oil drop from 40/0.Oil lvl gd,no warning lights.

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.