I am also curious. I ran Schaeffer Racing
Oil 20w 50 in my 302 HO in my Unique. A friend tested this
oil along side of 2 other motors running Mobil 1. They ran all 3 motors at 6000 RPM for 20 minutes (honda racing motors) and the one with the Schaeffer ran 15 degrees cooler and held better
oil pressure. This oil has a moly ingredient that becomes impregnated in the steel of the motor and supposedly assists in reducing friction. RD