I'll just add to the confusing topic of which oil is the best, by saying my favorite oil to use was Mobile1 20-50. I used it in a tired motor that saw lots of abuse. Blown head gaskets, water in oil, super knock, wasted turbos, lifting heads. The worst was when I made a pass at the track and the oil pickup tube fell off the block. I didn't realize I had zero oil pressure for about 20 minutes. No lie! I thought man my lifters sure seem loud all of a sudden!
One day I am going to tear this motor down and see what kind of super bearings or super crank is in this thing. Oil pressure was always right on the money. Did it live because of the oil? I don't know but that's how people come up with a favorite! headbang poon