Seafoam?!?

DocG

5th graders > me. They're not bant
Sep 25, 2005
8,297
1,358
194
Cincinnati area
Hey all. Just got a multipoint inspection done on my Stang since I bought it used...I'm sure the dealer I got it from did one, but at least now I have one on record with Ford in case something goes bad. Asked them about the knocking I've been hearing...and they say they didn't hear anything out of the ordinary. Sooooo....I'm still guessing detonation, but not positive. Been seeing all sorts of references to Seafoam around here. Can someone break it down on the specifics of using it all 3 ways? I'm guessing one is adding it to fuel. Heard the other is adding directly into throttle body? How would I go about doing this? What's the third way? I have a 04 GT....and yes...its yellow!

Anything harmful about using this product, even if I don't have detonation going on? Just trying to try some of the cheaper fixes before doing other things. Already cleaned the MAF and burning the tank of gas I have....which is half 87, half 93! Once gone I'll put pure 93 or 89 to see how it does. Thanks!
 
the only negative thing ive ever heard about it is that it may work "too good", especially on older, higher mileage engines. in other words it my clean out an area where sludge build up has actually created a necessary seal, and therefore a leak develops. ive never used it, but ive been meaning to. i even have a can sitting in the garage. when i bought mine, the guy at autozone was saying how he'd "never put that stuff in his truck, cuz he knows it ruined his friends hemi" this was the same guy with altezzas on his 87 s-10

i believe the other way is to feed it into the crankcase about 50 miles before an oil change. do a search on it, there have been plenty of threads about it.
 
I got 23k miles on it....hope there's not that much sledge to create a seal. Anyone know anything about Valvoline's 3 step treatment? Looks like it does about the same thing.
 
you should be fine with only 23k, as long as you've havent stretched every oil change to its limit. ive got 35k and still plan to use it. if anything, it will give you one hell of a smoke show!