I had an appointment for a oil change at 9:' am. I left around 11:30 to 12:00 to me that was a little longer for a oil change and tire rotation when they tell you to make an appointment. It seems like the appointed time doesn't matter. Also, if you are going to have to wait that long, they should have snacks in the waiting room. All in all the staff in the service department was very friendly, so I will be taking my Buick back for other services when needed.because that means a great deal.