These forums are designed, in part, to help people with their snowmobiles..... MOST engine builders have NO TECHNICAL experience in PHYSICS, CHEMISTRY or METALLURGY! They learned from whoever and their way is thr right way!!!! Just ask them and they will tell you!!!!! I used to be they guy who made a big stink about people who do STUPID STUFF!!!! I've also done some STUPID STUFF in my life,,, WHO HASN'T????? I am trying to help this guy who asked for some help... IF YOU USED A PRESSURE FED OILING SYSTEM, I would recommend regular conventional oil,,, but,,,we are dealing with a 2 stroke motor that is premixed with GASOLINE mixed with ALCOHOL... Do you remember the post that i wrote about ALCOHOL destroying the lubricity of CONVENTIONAL OIL??????? 90% of the fuel on the market has ALCOHOL in it!!!!! ALCOHOL hates motor oil!!!!!! (with a passion) It hates 2 stroke oil EVEN MORE!!!!!!! SYNTHETIC OIL IS YOUR ONLY DEFENSE against ALCOHOL!!!!! Do you want me to get into the specifics of it???????? LESS THAN ONE TENTH OF ONE PERCENT would understand!!!!!!! If I wrote a post on it, people would read it for about 5 or 6 sentences!!!!!!! It would give them a headache!!!!!!!! THEY WOULDN'T UNDERSTAND!!!!! So,,, use your conventional oil,,,wear your stuff out prematurely,,,keep buying top ends every 3000 miles and the parts guys would be happy!!!!! Then you could create a post about blaming KLOTZ why your motor doesn't last longer!!!!!!!! LUCKY YOU!!!!! Gary Oles nosboy