I bought a new 07 avalanche 2 years ago with the 5.3 flex fuel v8. at 28,000 miles the add engine oil warning came on right at 3,000 miles since last oil change. I thought maybe they put 5 qts instead of 6 at the place I got the oil changed at so I took it some where else and had the same result. I took it to the dealer and started oil consumption test at about 34,000 miles. The add engine oil comes on between every oil change earlier every time. I now have 49,000 miles and the add engine came on at 2,400 miles.at 3,000 miles it was down 1.9 qts. I called chevy customer service and they had a zone rep. call me and tell that this was within the normal oil consumption guidlines. between my wife and I we have purchased 6 new vehicles from GM and put up to 150,0000 miles on some and none of them blew oil. This is not normal. If GM is not going to stand behind there product then they are going to loose a loyal customer.