I have a 2007 GXP 5.3 ls4 and I changed the oil in October to mobile1 synthetic. I don't drive the car in the winter so the car had no miles on the new oil. Well last week I took the car to Memphis TN , about a 1100 mile round trip and when I checked the oil last night it was barely on the dipstick. I added 1 quart and it was back in operating range. That just seems like a lot of oil usage for 1100 miles. I know that there was a problem with the baffles in the valve covers but I was not sure if my car was one of them. It's goin to the dealership on Tuesday and they want to pull the covers off and check them out ... what do you guys think is goin on .... the car still has a drivetrain warranty so at least it won't cost me anything, I just don't like people working on my car...... HELP.....