Anyone use a synthetic 2 stroke oil??? Wanting to go that way, but don't want to go extremely expensive. I usually buy non synthetic by the qt for about $5. I mix my fuel by the 5 gallon can. I have a lot of 2 strokes. So I burn through a lot. I always wondered if there was a difference with Marine 2 stroke oil. I guess there is. Marine oil is for liquid cooled. All my stuff is air cooled. Ideas???