You need to figure out how many miles over the limit you think you might drive the car. If you don't think you will go over at all, take anything extra you can get out of them. If you are paying an extra $.05/ mile, the difference every 1500 miles would pay for an oil change. If you drive the car more than 4500 miles over, you'd be better off keeping your current contract. Otherwise, take all the free oil changes you can get. You already get a free rental from Chrysler for any scheduled service as part of their Premium Care program. This should include any recalls or warranty work. I think it also applies to oil changes, but I could be wrong.