A local small engine repairman told me that the best thing to use in two stroke engines is 8 oz of sae 30 motor oil with 1 gallon of premium gas. He said that using the regular two-cycle oil will cause it to seize under constant load. He has numerous vintage saws and string trimmers that have only ran on this mixture without fail. I've talked to many old-timers who have supported this theory. My Stihl dealer said that regular motor oil doesn't have the additives to keep it mixed with the gas. I've always ran the same brand of oil as the machine I'm using (I.e. Stihl oil in my saws). Does anyone have any experience with this?