Interesting. I have heard horror stories about SeaFoam destroying engines in minutes, and for that reason i've never used it.
Originally Posted by TWChamp
Way back when, before Seafoam, folks would use Coca-cola or just plain water. Wind the engine to a few thousand rpm and dump some down the carb. Either would violently vaporize to steam and sometimes blow loose built up carbon and other gunk. And sometimes the extreme pressure would destroy engines.
Originally Posted by reichsrundfunk
I can't imagine why an engine in decent condition and reasonably well tuned would ever need such violent treatment. A tune up, fresh oil and filter change and a hundred miles on the highway might do the same job with little risk.
But for a crappy old engine full of carbon and oil deposits, maybe it'll clean it up temporarily.