I have owned this truck sense October 2008. Service has been performed as recommended. I have not had any major problems with this truck what so ever. Minor problems I have had are the belt noise due to the power steering pulley misalignment and the rear tire wear due to factory door sticker calling for 70psi for the rear tires. Dealer took care of all and installed two new tires on my truck. Dropped rear tire pressure to 60psi. No more wear, Love the 6.6 Duramax with the Allison. What a combination. Tons of torque, great performance for a diesel, and quite. Average fuel mileage 18.5 back and forth to work and 22.4 on my last road trip.(12/09).