I can't believe I'm saying this as I have always been a Chevy man but if any vehicle your looking at has the 5.3 l v8 with afm/dod were it drops to 4 cylinder at steady speeds you may want to do your research. Those motors have been having oil burn off issues due to failed piston rings. I recently had this happen on my 2010 silverado crew cab z71 at 40,000 miles. In the process now of doing an oil consumption test which is just a hoop gm has you go through before they start changing things. I'm reading that the only way to fix the oil burn off problems is to replace the pistons and rings which out of warrsnty can be pricy. Many people have said the more you use the afm the worse oil burn off you get.

Sorry if tl;dr but just have been warning everyone of this problem Aperantly it may effect all alum block v8s wih afm dod since 07

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Posted by BayouBengalinBama

Member since Jul 2005

4398 posts

Posted on 10/31/12 at 9:52 pm to gsvar2004

Gs....just traded an 08 Sierra with AFM...only reason I traded was the oil consumption issue. I actually took to my mechanic and one of my plugs was missing all of the porcelain. Called dealer and they would not do anything for me...went to Chevy dealer across town and bought a Suburban. Issue is supposed to be corrected in 11 models and newer.

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Posted by dewster

Chicago

Member since Aug 2006

25395 posts

Posted on 11/1/12 at 11:47 am to gsvar2004

I have a 2007 Silverado with the same 5.3 L AFM that is used in most Tahoes and Suburbans.

110,000 miles and no issues at all. Best vehicle I've ever had by far, and I have no plans of replacing it in the next 5 years.

This post was edited on 11/1/12 at 11:49 am

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