Bob, that’s my guess, but you have to work hard to get to the turbo forum since the redo. In any event, you don’t want to use oil designed for low revving motors in a 9000 rpm pushrod motor. I have seen dozens of motors with ruined cams that I blame on improper oil. I have run numerous motors at very high rpm and have used oil that is designed for that load and the heat that goes with it. If you have a bike that always runs at 3000 rpm, buy diesel oil. The additive pack makes a difference for high rpm.