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I think Marvel Mystery Oil came into accepted use in World War II mostly by airplane mechanics in the field. Fuels had become much more complex with differing amounts of things like toluene, xylene, benzene, tetraethyllead, and Lord knows what other volatile, aromatic poisons engineer could come up with. The demon tweaks made possible by more volatile fuel almost doubled the h.p. generated by aircraft of the day. It was pretty toxic stuff and tended to gum up carburetors, necessitating periodic maintenance. Mechanics found by adding MMO to the fuel, the carbs required less maintenance (read disassembly & cleaning).
Same thing with gunk & sludge build-up in the crankcase with old non-detergent oils MMO seemed to keep things cleaner, or at least kept the crud up in suspension until the oil change.
Now-a-days fuels are so clean, and motor oils are so good, it kind of precludes the use of additives. That said, it's always nice to feel like you're doing something simple and proactive to help the car run better.
And the stuff smells very automotive when mixed with motor oil, gasoline, and 50 year old leather seat covers. I recommend a little dab behind the ears for date nights.
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