You do not have to have the Dodge Dealership do the warranty work on your car.  However, it is a good idea to use the service department of your dealership so that you can substantiate that you did have your car checked at every inspection date.  This way, if a problem occurs and you can show documentation that you had the oil changes, and inspections which are required to maintain your cars operation;  whatever the problem is,  it will be corrected free of charge in most instances.  Some people keep their receipts for any work that they have done to the car.  If a problem occurs, the dealership might suggest that it came from your usethe wrong parts or problems were created because an unauthorized mechanic worked on the car.  You don’t want to have those kinds of problems, because, although you might save a little money by going to an independent mechanic, if you need warranty work, and the dealer can get out of doing it for free because you did not have the car checked there; in the end, you will pay far more money in repair bills.