I did a lot of useless testing with
oil viscosity. Bottom line for 10wt jump I gained 5 psi hot at idle. All were the same at wot. 10w30vs10w40vs20w50. I ended up with 10w30 per builder. In the end I want the
oil flowing through the components vs over. It was really transparent on the rocker arms with 20w50 vs 10w30. The 20w50 just overflowed where the 10w30 went through.