Well, they're quite different products, although it's fair to call them both snake oil. Sea Foam is a solvent, Marvel Mystery Oil is a lubricant.
I've tried Sea Foam to clear the gunk out of a gummed-up carb. It didn't seem to help, although some folks claim it works wonders. I always end up tearing down the carb.
Now I religiously add a bit of MMO to each five gallons of gas I buy, and I use that gas in my tractor, lawn tractor, generator, lawn mower, etc. I really believe it helps prevent valves from sticking when an engine sits without running. Of course that's just my opinion. I suppose a dab of motor oil in the gas would work just as well.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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