everyone has there choice in oils mine (25:1) in the shee [better to burn oil then metal and cheaper for now haha], ill never run amsoil i did the research and it really shocked me. every builder i talk to tells me to run castor 927 thats the only oil i run and ever will. 2 other oils that are my next choice are Bel-Ray MC1 and all Koltz lubericants. But just think about it, if a oil has a low flash point, it is going to burn off the piston faster then one with a higher flash point. 927 has a higher flash point which will stay on the piston longer giving it excellent lube. I love 927 i run it in every 2stroke i own, even my weedwackers and chainsaws. OH of course my FAV motocross racer runs 927... RICKY CARMICHAEL!!