Penzoil Marine 2-stroke, 32:1 in the MB. Same oil (for years) in 50:1 in my moped. I can't remember what the oil was that I used to run other than the bottle was black, but my Moped ran just fine on it but would foul the plug every 250 miles at the same 50:1 ratio. No such problem w/ the penzoil, which is why I've stuck with it. Not to mention its easy to find.