As Thomcat stated, changing the oil at a faster frequency than the DIC wants you to will keep the older 5.3's happy and oil burning free. I also had a '07 Avalanche, which I traded this year on my current ride. I changed the oil in the old rig around every 5000 miles and never had any excessive oil loose between changes. That truck really served me well, ten years and just over 100k on it at time of trade. Just my opinion, keep the engine oil clean and the motor will be happy for as long as you have it.