The dealer was supposed to replace the pistons and rings under warranty on my 2012 GMC Terrain 2.4l because of my excess oil burning. After the work was done I noticed the engine was still really dirty as before. Looks like it was never worked on. So I removed the spark plugs to look at the top of the pistons. The pistons had some black carbon buildup in the center of the pistons. Also noticed some pitting on the pistons also. Is the new pistons supposed to look like that after 1000 miles?
I called the dealer to ask them if they really did the work. The service writer says he seen the engine torn apart in the shop. I also asked if they honed the cylinders? They said no that is not required.
I guess I will wait another 3000 miles to see if it still burning oil. Because it consumed 4 quarts of oil in 5000 miles before the repair.