I picked up a three-piece from an official BMW dealer and wanted to use it now as a payment for a seven-piece. The car is not fully paid off yet. Must be paid for another 1 year. Can you just give the three-piece as a down payment for the seven-piece or are there any problems because the loan agreement is still running? I had received the credit from the BMW Bank. If I now get a seven-piece from another authorized BMW dealer, there should be no problems with the three-piece than on to trade for the 7s, right? Has any of you already gained experience with it? LG