ORIGINAL: jedijody
If it were me, I would ask the person I'm going to look to for warranty and or service support. The engine user's manual also has something to say as to the recommended fuel/oil mix ratio.
I know of 2 people who have had oil related problems with 2 different brands of oil. The brand of the oils is not important. Both oils are the same ones guys in this forum are using DAILY. Popular brands of oil that come highly recommended from many happy users.
Whats important is that the ENGINE manufacturer refused service by saying, "It's not our fault. It's an oil related problem. Contact the oil manufacturer."