I'd be more concerned at what the ethanol is doing to any rubber that is in contact with it (and/or plastic fuel tank). Particularly on older pre-ethanol bikes, I only run E5 ('cos that's our only alternative to E10, other than Avgas). I periodically put Mannol Benzin Additive (or Stabil, if feeling rich/generous) in the tank - whether it does any good or not, is another question.
(Of course, the newer bikes are designed to handle/be resilient to E10.)
I will not use and highly caution against usin STABIL in any vehicle that has rubber or plastic parts in the fuel system. Several years ago I used it extensively in snowmobiles and boats, the 1987 Johnson 115 oil injected developed serious damage to internal floats and injector,first thing mechanic asked was if I used Stable and proceeded to tell me how it disintegrated internal parts.
Also using it in Artic Cat snowmobiles from the late 80’s early90’s resulted in weakening the seams on the plastic gas tanks and leaking on 2 of my than 3 sleds requiring replacement of gas tanks.
I switched to using Sea Foam and none of my toys or vehicles have ever had problems. But I also don’t run ethanol if I can help it except in cars RV and pickup, but always the 10%.
Just my experience.
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