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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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