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There's a handful of them that are okay as a preventative maintenance sorta thing.  None of them will really fix mechanical problems.



Chevron Techron is the only one I'm aware of approved by a few OEMs, GM, Ford, BMW, Honda and Toyota I think as well.  Mostly to deal with sulfur contamination to fuel senders, causing weird gauge readings and such.



Seafoam ranks up there with the Obama administration in terms of scams and lies.  I wish I would have thought of it myself, I'd have been retired like seventy times over.  There's nothing in that can that will do what they say it will do, it's three ingredients that you can purchase and mix together yourself to make the same basic product if you were so inclined.  At best it's a waste of money, at worst it's a good way to fuck up an engine and/or catalytic converters and O2 sensors (if so equipped).

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It was done by a Tec 2000 chemicals representative, and as far as I know the demo is not on the internet.