I've just purchase my 2007 GMC Sierra 5.3L and notice immediately that on a long extended drive I was burning between 1-2 quarts of oil. General motor vehicles with the AFM system is the cause of this. People were saying all kinds of different things to do to fix the issue and some were saying the only way to fix it is to disable the AFM. I purchased this device and it does exactly what it says. I have drove about 1000 miles so far and no oil consumption yet. Very Pleased so far!!