The engine builder notes specify the use of Driven-brand HR4 synthetic 10W-30 oil, which is what I'm using. Sorry for my earlier "shorthand" that said just 30-weight.
At full operating temp the observed OP above 3krpm is about 40-50lbs.
I'm monitoring the OP with an AutoMeter mechanical gauge, that is fed from the oil filter housing. I don't have any reason to suspect a faulty/inaccurate gauge reading.
I'm fine with the high OP at cold-start, and the 40-50lbs at (hot) cruising rpm. My biggest concern is the 8-9lbs at hot idle.
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