So i have this buddy who's got an E36 M3 w/ 140k on it. He was having missfire issues for a while. He tried everything he could think of to get it to go away. Took it to the dealer and everything and they told him that he should run Sea Foam through it.
So he goes to the auto parts store to find this stuff. He gets it and sucks it into his intake manifold via a vaccuum hose. Immediately his car starts running like holy hell, spitting and sputtering and all that and he starts shooting just pitch black nasty exhaust. So he shuts it off like the instructions say and lets it sit for a half an hr.
After the half hour he goes back out starts it up and takes it for a drive. I guess you're just supposed to beat the living **** out of it so that's what he did. Redline after redline until at the end of a day full of driving, the smoke started getting thinner and thinner until it was back the normal color and stink.
His review of it is that his car has never run better, ever. It fixed the missfire, and the idle is smooth as silk.
I guess what it's supposed to do is burn all the crappy buildup off your valves and pistons and stuff and make your internals "so fresh and so clean, clean." So i'm guessing it's an acid. You can put it in your oil, fuel and any other place too so he went and did the same for both of those.
He went back and got his oil changed after 50 or so miles (only about 200 miles on that oil change) and the mechanic came out and said, "did you run Sea Foam on your car? Cuz your oil is the blackest i've seen in years. Good **** isn't it?" lol
So i think i'm gonna try this stuff. My car doesn't feel right, right now. When i start it warm, it fires up then the R's drop to like 300 then it jumps back up to idle at 500. It's strange i think. So i'll post back when i do this. Maybe even post pics of the nasty black smoke i produce... cuz it's gonna be awesome... and smelly.