I've noticed Ultra Low Sulfur GASOLINE resists turning black as easily as non top-tier fuel. I've gotten my son-in-law to use Premium in his Yamaha 2 cycle 60 HP outboard. Now if I can find "the" better quality 2-cycle oil I will be a happy camper
There are premium 2 cycle oils available. The Mfg's suggested product may be the better solution and may not.
FWIW, I used a premium 2 cycle oil for a fleet of different engines (no outboards, though). It was mixed in a 50 gallon drum and hand pumped into the different small engines or gas cans for use. I didn't have a single engine failure in 6 yrs of use. Some of these small engines saw terrible duty cycles.
For outboard engines I try to use the Mfg.'s suggested oil except on my old Johnson 15 HP. That thing will run on just about any mix and will just smoke up the plug if the mix is wrong. It's easier for me to clean a plug than buy premium 2 cycle in that situation. My chainsaws run on Stihl oil even if they are a different brand of saw. It will also work with other different brand and sized engines with no plug fouling.
This website,
Bob is the oil guy has more information about oil and lubricants than the average consumer needs to know. Beyond that, technical data sheets from the Mfg and the knowledge to decipher them are the next step.
