4 letters... H E A T . That's the reason you hear so much about oil coolers & oil temperature on the boards. Running tolerances a little looser doesn't help, either. I use a synthetic blend 10-40 oil which helps keep viscosity up after extended running. When it's at it's hottest, I'll drop to 10-15psi at idle, and 40-45 at speed. I would like it higher, and probably could with an oil cooler, but as is, it's not a problem.