I wasn't real big on Marvel Mystery Oil until my NAPA/racing friend recommended it. I've never put it in the tank, but it DOES quiet lifters down. I also soaked my new hydrolic lifters in it, by his recommendation.
I suggest that with any product that gives good benefits, it should be remembered that more is not always better. Sometimes the best results are from, as you say, "a little dose of it".
Just for the record: I did not suggest running the engine with paint thinner or kerosene in it. The suggestion was to pour it through the top, let it come right out the bottom. I offer that simply leaving sludge in an engine is not a good common-sense practice.
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