Dropped my car off on 9 Dec for a service. My vehicle was also making a loud noise that I asked to be looked into. I was informed that my rear differential was leaking. Dealership was contracting GM for assistance regarding the repair. I was told parts had to be ordered. I did receive a loner vehicle, however, i wasn���t notified that my vehicle was ready for pick up until 24 January. It took well over a month for the repair to get done.