ur2slow

I just purchased a 2008 Suburban with the 5.3 alum. flex fuel motor. It had 33,000 miles on it three weeks ago when it was purchased. I had the dealership certify it when I purchased it due to a engine light being on during the test drive. They told me that they did an oil change and fixed some "air bag sensor" to fix the problem so all was good.....for a week. After the first 1000 miles I checked the oil and it didn't register on the dip stick! I thought that they made a mistake while filling it. Very soon after that the engine light started coming on again so I took it in to a different dealer who came up with a o2 sensor code??? I start doing some internet research and find this sight and feel like I've been swindled. I checked the oil today and it was dry again with only another 1000 miles on the odometer! it took 2 quarts to get the level up to the top hole on the stick. That's 3 quarts in 2000 miles!! I have a feeling that is the reason the o2 sensor went bad and the previous owner traded it in. I went to the dealer to have a talk with them and will be starting the consumption test.....wish me luck. I love the truck and sick that I just spent $32,000 on a BIG problem.