I haven’t ever put anything besides gas into my tank and she runs just fine. But people swear by Seafoam. I’ve heard it’s popular with the boating crowd as well. I tend to go with the ‘if it ain’t broke don’t fix it’ mentality and don’t put anything in. My only winter storage practice with fuel is to top off the tank before storage. Less air, less condensation, or so I’m told. Fires up just fine every Spring.
