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i just did my truck w/88k miles and it barely smoked. put the other half in my wifes car and it smoked just a little more. kinda wanted to smoke out main street but atleast my engines clean.
i just did it a couple hours ago, tons of white smoke, i had to rev it around 2 grand to get it to do that, after about 25 min of running it i noticed that i had slightly beter throtle response and better idle. Worth 6 bucks to me.
you should put 1/3 of the can in the vaccum hose while running, 1/3 of the can where you put your oil in, and 1/3 into your gas tank. the last two with it shut off.
I just dumped all of it down the vaccum hose with it running. cause I always use synthetic oil and I had fuel injector cleaner in the gas already. but if you use regular oil then I would put some in the oil too.