One sled I used Seafoam in over summer. The next winter it wouldnt run worth a darn. The rubber fuel line in the tank basically dissolved. I dont recall the miles on it at the time, maybe 4-5k. Had maybe 5 fillups in its life with E-10 fuel. Otherwise was strictly non ethanol fuel.
Hey Im not saying it was the seafoam, but not sure what else it could have been.....
If you want to store it with good stable fuel, go buy some AVGas. Its cheap right now. Hartford WI airport, or any airport.
And before you tell me thats no good, my bud has been using it in his high compression turbo 2 stroke for 3 years. Its GREAT fuel.