I know TCW3 two stroke oil works Tim, how's that? I'm taking the chance, and enjoying a better running beater as a result. People walking across the street take chances too, no big deal. Again, go to LS1 board, that's if you can and ask there. Preach to the guys who ran the 6,000,000 million miles and tell them. Link to this site so they can fully understand you. Sorry for grouping TCW3 into the UCL category, truth is that is what it's being used for over there, and what I'm taking about here. Besides IIRC you aren't a fan of MMO, or Lucas UCL either are you? Do you believe gas is perfectly formulated to be the very best for your engine?