I used air cooled oil it said for all air cooled engines It had atc chain saw trimmer an snowmobile pictures on the bottle... it was pensoil... an it has a little less oil maybe cuz I didn't quiet have 2 galloms so I didn't quit use 8 oz.... anyone wanna tell ne where to check the carb to see if ot was plugged there an I jus found out my donut gasket was missing.where the pipe connects to the motor