We recommend Klotz Ow40 Snow oil for all 4 stroke snowbikes. It works awesome, smells great, and I like the red color because it allows me to monitor oil wear as it gets darkened.......BUT here is the kicker in this oil debate. CLEAN oil is the best oil. If you are spending $1.99 a quart or 19.99 a quart and you don't change your oil often or watch to make sure you are not getting moisture in your oil it won't matter. Oil is like religion, so find one you believe in and make sure you keep it clean, it is the lifeblood of your engine.