For what it is worth, have a 2009 c2s bought 6 months ago with 20,000 miles on it and I have needed to add 1 quart for the first 3000 miles. I always check in the garage after driving home from work so that I am consistent in my process. Just had oil changed at dealer and all looked good to them and PPI looked great. Still, it took some mental adjusting to get used to that slight oil smell I get after a nice hard run.