Quote:

160 is fairly cold for oil temp so need to run the lighter weight oil.

I run Royal Purple XPR 5W-30 in my dyno engine. We try to get the oil temp up to 200 degrees but it is almost impossible to do even with a big heater in the oil tank. My oil lines are insulated which helps but the oil still cools off really fast. My engine will hold 80 psi at speed but at idle it drops down to about 30 psi hot.

I agree. Even with a diaper on my aluminum pan it's difficult to get oil temp. I bring the water to 200 before a run let it soak, then cool the water to 140 before the run. I've been thinking about a pan heater. Mine will have 100+psi cold. Warm 20-30 at idle depending on oil temp, always 60 in the traps after 120 degrees. I've run as low as 40 in the traps with no bearing issue. I was to chicken to leave it that low.
Doug