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Well, for what it is worth, my truck started using a ton of oil (2 quarts in 3k), I disabled AFM 500 miles later with an inTune, so all the hardware is still there just the system never activates. I just recently changed my oil again, 8500 miles, used 1/2 quart or less during that time.

Now, to be fair, when I first got the truck, it didn't use anything worth mentioning during that change the dealer had put in it, for about 6k miles. I don't know what oil they used, but I started using Mobil 1 like I have used in my vehicles for years. Did that trigger something? Maybe, seems unlikely since the oil usage practically stopped after I tuned out AFM.
 

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AzDragonLord said:
Not all AFM systems have issues. With 125K miles on my stock 2009 Sierra, I'm only losing about 1/2 quart of oil every 5-6000 miles. Of course I've always used Mobil-1 oil and filter exclusively.
Careful man, I said the same thing about mine, until about 136k or so was when I noticed it drank the 2 quarts.
 
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