I Seafoamed my 4x4 with 155k on it today. Didnt get the whole yard smoked out, but I didnt use that much... I filled up a spray paint can lid with Seafoam one and a half times basically. Started it up and not a bit of smoke. I wasnt impressed, haha. Then I revved it up real quick and noticed it was alot smoother, and that there was a nice cloud of smoke coming from the exhaust. I just got one big cloud of smoke, and some haze coming out for another minute or two. Either my driving habits kept that thing clean, or I didnt put enough in. Im willing to try it on the Stang soon though.