Seafoam is bogus. The only reason it causes so much smoke is because it's petroleum based. Apparently people don't like to read directions either, because if you read them you'll see that you should only add a third of the can to the gas tank. If you truly want to learn about what works, go to Bobistheoilguy.com. The best performing fuel system cleaners are 1) Redline SI-1 and 2) Gumout fuel SYSTEM cleaner, NOT the fuel INJECTOR cleaner.