Seafoam is intended as a fuel system cleaner to remove dried fuel deposits. I have never tried it, buy most who have say it works.
Marvel Mystery Oil is a holdover from the early days when non detergent oil was all that was available, and gummy valve guides would make valves slow to close, hydraulic lifters would collapse. The oil treatment would supposedly free everything up. That was before my time, but I doubt it did much other that turn more sludge loose!
Berrymans B12 is a cleaner. It is (was) marketed as a fuel system treatment, which would probably do nothing but turn more trash loose in an already contaminated system. But it is much more valuable as a non petroleum solvent. Good all around cleaner, good for cleaning brake components that must be oil free, good for degreasing before painting, etc.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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