How to Upgrade Car Parts When Your Vehicle is on Finance Buying a new car with a finance plan helps you manage payments over time, but what if you want to switch to a different car later? You might consider trading in your current car for a better fit Can I part exchange car on finance? Part exchanging means swapping your old car for a new one. The dealer evaluates your current vehicle’s worth, which goes towards the down payment for your new purchase. If you agree with the offer, the dealer purchases your car. But, trying to sell a car with outstanding finance might violate your contract since the vehicle isn’t yours until the finance is completely paid off, along with any fees. You have two options for part exchanging a financed car: pay off the remaining balance before trading it in or let the dealer include the settlement amount in a new deal.