Some additives serve a useful purpose and many do not. I have never had a problem with pump gas with "up to" 10% ethanol. So I figure trying to avoid a non-existent problem is kind of silly.
Unleaded gas "lead replacer" had its time when it helped preserve valve-seat life in some cases. Now? Not so sure. If an engine has had valve work since 1973, it likely was done with hardened parts that do fine with unleaded gas. Even an old engine that has never been rebuilt will likely have work-hardened valve-seats. So unless you have an old, never rebuilt tractor and use it hard, all day long, I doubt any "lead replacer" will do a thing for you.
I DO add two-stroke-cycle oil to my diesel fuel for my tractor and pickup truck. I know 100% it does not hurt. It is prevented wear? Maybe and maybe not. I am not a chemist and do not check lube-levels in the pump fuel I buy.
I have no idea what "Sea Foam" is supposed to do for anyone except make their wallet lighter.
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