I know this has been talked about before but what's normal? I took my 07 LTZ in yesterday for a few little things and when I pulled in the service bay the check oil light came on. I'm thinking this thing has used 2 quarts in less than 2k miles. Never noticed this before and yes I know it takes 6 quarts. The service writer said they would run an oil consumption test on it. Wonder how they do that? Thought's ?????