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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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