I used to use penrite ts40c - unfortunately you cant get it anymore so i had to choose a new one, so i went back to the place that i used to select that oil - ROTAX aircraft engines The way i see it if its good enough up there, its good down here, I checked the forums and no one was having problems with the recomended oil at 50:1, so I was ready to try it - I run 40:1 just to be on the safe side with BP Ultimate In every 2 stroke Bike i own, and after 2 years racing no probs, The Oil Castrol ACTIV 2T, Yes i know hard to believe.
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