[Johnny Mullet]

If there was a miracle mystery juice that restores an unmaintained engine back to new, then everyone would have over a million miles on their cars. How do you think our company maintains a fleet of trucks with over a million miles on them? With "miracle juice"? No, but with regular maintenance.

I tear down engines all the time and can tell if it has regular maint done just by looking inside. I maintain my crap and never had an engine fail on me. Now, I do know that Seafoam does clean a gunked up engine and regularly using it keeps it clean, however, dump some of that into an unmaintained engine and there is the chance of carbon deposits getting lodged into the valve seats and burn it up.