To each his own on 2-stoke oil, really any oil you run through a lawnboy is going to work well given the operating Rpm and HP out put. I have been snowmobiling for over 20 years, since most current snowmobiles have power valves that tend to gum up and cause running issues. Ash less and oils that do not build up carbon is a must. I have used Blue Marble for 10 years in all of my 2 stokes snowmobiles from a 600 to 1000 cc. I do not have to clean the power valves only inspect them. I would think the issue of plugging a muffler with carbon should be greatly reduced using an oil like blue marble.
Amazon.com: Blue Marble 2-Cycle Oil - 1gal. FG0007-GALLON: Automotive
Amazon.com: Blue Marble 2-Cycle Oil - 1gal. FG0007-GALLON: Automotive