Re: Seafoam Use
I'm no fuel expert, but from the articles I've read, the rule of thumb is not to exceed 10% alcohol. Ethanol is alcohol. The reason to run a higher octane is it could contain less ethanol than 87. 87 is the only octane that "has" to have 10% in it. If you have E10 in your tank, you have 10% already, and the vast majority of fuel treatments, incuding stabil and seafoam have some form of alchol in them to help with moisture and you now have more than 10%. Alcohol is tough on plastic fuel tanks and eats fuel lines. (I think it's harder on fiberglass tanks.) I don't have access to marine fuel, but if you do, it may be worth using, then you can add seafoam or stabil etc. cause I believe it has little or no ethanol. Also only put in your tank what your going to use in a few weeks, cause alcohol based fuel draws moisture. Cars can get away with it longer because newer ones have closed unvented systems. I am a firm believer in Seafoam. But I think it too has to be used in the right content. In my own boat, (Ranger with 150hp Evin '86) I went to 91 octane with no additives, and (I believe) it starts faster and runs smoother. (It may just be wishfull thinking).