My wife has a 2007 Chrysler 300C with the hemi engine and had about 32,000 miles December 2015. I happened to check the oil and found nothing on the stick. I added about 6 quarts of 5W20 that week to get it back to full. I ended up adding 1 to 2 quarts a week for the rest of the winter. She does not work in the summer and car was used very little. I had it serviced at the dealer 8/9/16 at 34,295 miles. When I told them about the oil usage they said that it would be a waste of time to look into it unless it was brought in while it was actually happening. I checked the oil yesterday (10/16/16 at 34,900 miles) and it was barely on the stick. I added the two quarts of 5W20 that I had and today it still needed another 2 quarts. That is 4 quarts in 600 miles. We bought the car new and have had it serviced at 3,000 miles or less. It is not leaking anything and I do not see any evidence of it burning oil. any thoughts/ideas??

Update from Oct 23, 2016: I ended up putting 5 qts in over 4 days and 38 miles and it is just at the add mark (34938 miles).