A friend of mine is a fairly well known engine builder here on the east coast & builds high dollar engines($40-50g), and spends countless hours on his engine dyno. He swears there is no purpose for multi viscosity oils in a performance engine. He reccomends straight weight oils only for hi-perf.
I mentioned the
oil psi situation to him & his first question which I don't think was asked yet was is this a drop in pressure or what the engine has had from the outset. Either way, he believes 20psi hot at idle is minimum and 45-60psi hot hi rpm is optimum. Anything higher is hp robbing and actually worse for the oiling system. His first reccomendation is to change over to a straight weight (SAE40 or 50)and see how the pressure drop is when hot before cracking open the engine. 38psi at 3000rpm doesn't sound like a problem, but what is the
oil pressure at higher rpms?