Finally tried Seafoam on my newly aquired 2006 H3, It has 61,000mi so I didnt expect much smoke but I sure got some! Seems to shift smoother now, but could be placebo. It was nice to see all that carbon burnoff, biggest problem was getting the brake booser tube off of the MAF area, but once the tube was connected and gave it come gas it sucked up the 1/3 bottle and began smoking pretty quickly. Shut it off for 10 mins and it was puffing away for another 15. I figure this cant hurt!

 

It is recommended that you do an oil change after as some of the seafoam can get past the piston rings and into the oil.

 

Oh I treated the oil, gas, and upper intake as recommended. Car runs better as advertised. Ill change the oil shortly but ive read a few hundred miles is good to adequately clean the crankcase. Its advertised to do no harm to the oil at all and seafoam does not even recommend to change the oil, but im going to as ive just aquired the car and figure its only going to be better.