OK! Got to tell the truth about my oil mix. I use Pennsoil mixed at 40.1 Do I think it's the best? of course I do. Is it the best? How could I possibly know the answer to that. Besides, "The best," is always subjective to many different applications. If I need to know which glue I should use in building a particular part of an aircraft.....I fall back on mt 47 yrs of building in this hobby. If I want to know what "OIL" I should use in my GAS engines, I fall back on RCIGN1, Silversurfer, and rcbugman recommendations. After all..........Those three gentleman probably have ran more gas through these engines, than all the rest of us COMBINED Finally....when I want to know the best oil type and mixture I need to use for a particular GLO, engine. I rely on what Clarence Lee, "RCM" recommends. Bob Laine