Back to your original question, I've had more than a satisfactory experience with Passport Chrysler on Duke Street in Alexandria. Bought my used '07 Roadster Limited there in March with 6400 miles. They agreed to a free oil change as part of the purchase contract, and I just had it done at 9 months, but only about 2800 miles. If I were paying to change it, I'd have let it go a little longer, but I think that about a year is long enough regardless of mileage. I think the manual says something like that. I also had Passport look into leaking valve covers (those little deals that attach to the actual valve cover). They said they have learned through experience to use some gray sealant that they got from Mercedes -- put it on both pieces and let it set up a little before joining the pieces. So far, it's working fine. No other problems with the car. Good luck with yours. I love mine.