Always a topic for disagreement but my two cents is buy a quality mixing oil made for air cooled engines and use it at the label ratio. Somebody asked about "outboard" oil and the answer is differant operating temps for water cooled engines. Some outboard oils meet the lessor or older air cooled engine specs but none of them meet the toughest newest specs for air cooled engines. Oil is cheap enough why take a chance is the question here? I personaly own 25 saws from brand new to antique and I run the same fuel mix in all of them, Stihl sythetic at 50-1. While I admit the antiques only get run enough to keep them limbered up it also doesnt take long for lubrication failures to show up either. My experiance from the pile of non-running saws, weed eaters, tillers etc that show up at my shop door tells me a person should worry about keeping his fuel mix fresh, proper storage preperation and his carb set right rather than what brand of oil or oil/fuel ratio he is using, other's experiance differs.
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