Needed a rear main seal replaced on my 2006 Yukon XL. Called Justin who not only gave me a great price but guaranteed their work. The vehicle was dropped off in the AM and I got it back that evening. They used only GM genuine parts upon my request. The vehicle now has over 5000 miles on the repaired seal with not one drip of oil. Mind you, I was losing about two quarts a week which was dripping onto my driveway and anywhere I parked the car. Finally, I have found a repair facility I can trust who won't gouge me or suggest unneeded repairs. I highly recommend these guys for your repair needs.