my 2010 3.6 uses oil.....
depends on the type of driving I do. highway vs stop and go.
But over the last 128,000 miles of my Traverse- its been up to 1.5 qts per 5000 mile oil change intervals.
My current 5000 mile oil change interval-- I've added 1.9 qts to keep the oil at my FULL level- 1st time Ive gone past 1.5.
Actually changing oil today- as I hit 5000 miles yesterday.
My true full oil level-- is the oil level shown on the vehicle after I change my oil and filter.
I also measure the oil that comes out.
I keep 2- 1 qt bottles that I use exclusively for adding oil during the oil change interval.... this way I can tell how much im using.
2013 Equinox LT1 3.6L V6 FWD 88,000
2010 Traverse LT1 3.6L V6 FWD 153,000
2003 Trailblazer LS 4.2L I6 RWD 181,000