RockyMtn

First, a thank you to this forum. This thread was invaluable in preparing before I took the truck to my local GM dealer. 2011 Silverado, 5.3L, aluminum block, AFM, 30,000 miles, 1.2 quarts of oil consumption in 2,000 miles. The month of manufacture was May 2011. The truck should have been built with the updated valve cover and the AFM shield. The oil was very dirty with 67% life remaining. I typed up a cover letter explaining my symptoms with a copy of #10-06-01-008G (I think ...008I is actually the latest version) bulletin stapled to it. After having the truck for a day I got a call from the Service department. I was told I would have to go through the oil usage verification process and would have to bring the truck back to check usage. I requested that my Service representative carefully read the bulletin and review with his manager. I think it helped to have everything in hard copy so the manager got my input without any miscommunication. A day later I got another call. After review, they concluded that replacing the pistons and rings was the right solution. On the forums and talking to the dealer I have yet to get a good technical answer on what is different about the rings and pistons they are putting in. The work order for the new rings says 19208677 - RING KIT 0.643. The pistons are 19208675 - PISTON KIT 0.629. These appear to be vanilla parts. One website (OEMcats.com) said the ring kit fit 628 GM cars from 1999-2012, including all Silverados in this period. The piston kit covers 358 GM models from 2010-2012. The rest of the work order was gaskets, seals, oil, and filter. My conclusion is I got another set of the same rings and pistons that the truck was originally manufactured with. I have a Diablosport Intune on the way, AFM will be disabled.