We bought a 2012 GMC Acadia in April 2016. Upon purchase the rear wiper arm was gone and there was trash and dirt in the seat tracks (horrible detailing job). We were told by the finance manager that they would not replace the rear wiper arm even though it was missing BEFORE we signed the papers. This Acadia was parked on the front line in this condition. They ended up replacing the wiper for us. The day that was done for us they were also supposed to reapply the polysteel coat, but failed to do so although it was in the work orders. I had to go back the next week to have that done and was told it would take about 2 hrs, however after 3 hrs and no phone call I called only to find out that they had only done the inside and said it would be a couple of hours still.
Today I went in for an oil change and to have the rotors turn only to be told that it was going to cost almost $600 for the new brake pads and rotors when we can get everything to do ourselves much cheaper! I was supposed to have a loaner for the day and when I got there I was told that I had not been scheduled one even though I had talked to them about it, they had to scramble to find me one and even then almost didn't give it to me "because it's a truck", I grew up on a farm and I continue to drive trucks all the time while pulling a trailer.
I will NOT BE using them again, I will find another GMC dealer to do all of my warranty work and oil changes!