and then they're perfect, just under 60psi while highway cruising and right at the first line at idle. Under boost wnd high rpm it reaches 80psi. I run 15w-40 and might go 20-50.. IMO, its better to have thicker oil and habe oil pressure a tad ob the higher side than to have low weighted oil and have low pressure. Our engines aren't built with the tight tolerances as new cars that run 0w-20 these days.