I have a 396-375hp motor in my 67 camaro and I've always use 10w30 in most of my cars. I have a little valve train noise and wanted to know it this thicker 20w50 will keep things a little less noisy? Plus I want to make sure that this will not cause any problems with my oil pressure. I know it will probably bring my pressure up. 70psi cold and 40psi warm at normal driving speeds. What is a bad PSI (high side).