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Originally Posted by curtis73
Question is, what did it do to the rest of the engine? 
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that is the definite question. Having been into some engines after additives have been added and seen the very ugly results, I have no desire to experiment.
But i have used seafoam (which is glorified diesel fuel, I think) in engines that had carbon build up (ticking lifters, burning oil, etc) with some marginal success....but that has some inherent danger too, thins the oil.
Bottom line, there's either disadvantages they don't list, or if there's no disadvantages, there's probably not much of an advantage either