I had nothing to do one day and had an old BS push lawn mower, some old weed whackers, and a couple of chain saws sitting around that I thought had outlived their abilities. Amazingly I got all of them running sweet with the stuff.....didn't happen immediately, but as the stuff cut through the carbon and varnish, the engines just kept improving in performance....within an hour give or take of fooling with each. Use it in my outboard motor and zero fuel problems...like didn't touch the carbs for over 10 years and it started and ran like a champ. Not a substitute for 2 stroke engine oil....consider it part of the fuel in the mix ratio, not part of the lube.