Hey Lou, it does have that on the warning label so i guese it is petroleum based. Is the synthetic addatives a markating thing? I noticed i was getting oil splatter on the bottom of the plane that the sythetic guys arn't getting. There is an asmoil dealer at my field. I think i will use there 50:1 after i finish the echo stuff up.

Also, when tunning this thing i leaned it and continued to gain RPM untill it finally died in transition. I am not very familiar with gas carbs so i was wondering if that would mean my low end is actually to lean still.

Thanks