I've been reading some info about this, bunch of people saying it's good to use to clean up carbon, fuel injectors, crank case, etc. You're basically supposed to put it in everything except the radiator. I was wondering what the Garage thought about this stuff. I'm doing a tuneup on my Freecar Altima, and it has 171+ thousand miles on it. Can Seafoam damage an engine, especially a high-mileage one?