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In the proper low concentration in fuel it works great. It doesn't deposit carbon in your cylinders it removes it. It also helps to lube the valves and if you have coked up rings it'll help free them. As an additive I find it's less harsh on soft parts like carb diaphragms and o-rings than Seafoam which has even stronger carbon removing and engine cleaning capabilities but none of the lubing properties that Marvel Msytery Oil has.
But personally I would never add it to engine oil. Good engine oil and a proper oil change routine are far better than any additives. But as far as fuel systems go Marvel Mystery Oil still has a place, especially with ethanol gas Marvel Mystery Oil helps to combat minor corrosion that the ethanol tends to produce due to ethanol's propensity to attract moisture. The oils in Marvel Mystery Oil help combat that moisture.
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