I Used Amsoil In My 500 Hp Late Model Dirt Car Back In The Early 1970`s. I Beleive Thats When The Company Was Young . That Was A 4 Cycle, In The Crankcase !! The Oil In The Fuel Is The Only Lubrication The Little Engine Gets. Its Kinda Sorta Important ! That Little Motor Works Hard, It Deserves Good Groceries ! I Have Been Burning The Cheaper Mix Oil In My Saws And Friction Drives This Summer. I Have Had No Problems, But Have Noticed The Smoke . I Am Going To Go Back To Premium Oil. It May Cost About 3 Times As Much, But Still Doesn`t Amount To Much Money.
Mho.