Oops - sorry. Didn't mean to start an "oil war." But that's probably why I almost killed my Fuji. Probably could have used more cooling, but probably too much prop (Mezjlik 20 x 10). I was running Klotz 40:1 and after about eight - ten gallons she started loosing power. I removed the cylinder and there was LOTS of carbon deposited on top of the piston and in the combustion chamber. For the most part, the cylinder walls were just fine. New piston and rings and 20 x 8 prop and she seems to be happier (but I still need more power, thus the swap to the DL).

Okay then, I'll go with the Lawnboy Ashless @ 30:1 for two gallons, then Amsoil @ 45:1.