I have a 2009 Traverse with 30,000 miles on it and having the same problems but dealership told me "New GM products can use up to 1 quart oil for every 2000 miles" ? They also advised me it was 4 quarts low when i first took it in for problems with transmission slipping and was rolling forward after put in park.
They changed the oil and said it was exactly on full and that was my problem but no one knows where the 4 quarts of oil went even service manager ? Brought home and 2 days later it started makes clattering noises on a cold start . Took it back in and now they say needs timing belts changed ? I have seen many problems on this but no where that it was actually resolved ?? Hope you have better luck with yours.
You are not having the same problem as the other chap, if you are having oil consumption issues. Engines, with a 2008 build date, are having premature timing chains failures, they are chains, not belts.
If you vehicle was 4 quarts down, I would think oil is not being changed frequently plus oil level is not being checked, in between changes.