Stuck rings is a common problem on many GM LS engines, mine included. I purchased a used 07 GMC Yukon Denali w/6.2L gasoline LS engine w/131k miles. It was consuming a lot of oil, so I installed a catch can in the PCV vacuum line between the valve cover and the intake manifold. It was catching 1 oz of oil every 100 miles. I soon learned that GM offered a new improved driver side valve cover. The PCV is built in to the valve cover. The original vc PCV baffling was a poor design that allowed a lot of oil to be sucked into the engine and burned, eventually sticking the rings.
When doing my home work for this problem, I discovered GM TSB 10-06-01-008M for this problem. To unstick the rings I pulled all my spark plugs, soaked all the combustion chambers with Gunk Motor Medic for 48 hrs, moving a crank back and forth every once in a while with the harmonic balancer bolt. This did the trick. I've since put 20k miles on it and now it consumes 1/2 qt every 8k miles. The catch can catches only 1 oz/8k miles.
For non-mechanic types, Valvoline Premium Blue Restore may be just the ticket.
Here is the GM TSB link: LINK
Here is Valvoline Premium Blue Restore link: file:///C:/Users/donje/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/Valvoline%20Premium%20Blue%20Restore%20Oil%20(7).pdf
When doing my home work for this problem, I discovered GM TSB 10-06-01-008M for this problem. To unstick the rings I pulled all my spark plugs, soaked all the combustion chambers with Gunk Motor Medic for 48 hrs, moving a crank back and forth every once in a while with the harmonic balancer bolt. This did the trick. I've since put 20k miles on it and now it consumes 1/2 qt every 8k miles. The catch can catches only 1 oz/8k miles.
For non-mechanic types, Valvoline Premium Blue Restore may be just the ticket.
Here is the GM TSB link: LINK
Here is Valvoline Premium Blue Restore link: file:///C:/Users/donje/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/Valvoline%20Premium%20Blue%20Restore%20Oil%20(7).pdf