I assume that it is your first "A" servive.That is a basic oil change. However, I am somewhat confused. Is the car under the 3/36,000 mile bumper to bumper? Is the car covered by the lifetime power train warranty? What year car is it? Have you talked to the Mercedes dealer and have you told them it is a Chrysler?

If you answer these questions I believe you will get better info to your questions. Those do have a impact on the decision.