I have used it as a detergent in motors before and it works. Most noticeably to free stuck valves in small lawnmowers. I would not say it is snake oil, but a light machine oil with additives, probably no snakes. Similar to ATF but they each have different additives and the ATF is not meant to be burned like MMO can be.
Where are you talking about using it, in the crankcase or in the fuel?
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