You might get a short letter saying you paid your car off, and your title will be mailed to you shortly. An auto loan payoff letter is just a way to prove that you have paid in full for a car.If you are selling your vehicle, often the buyer will ask to. Getting the payoff quote is simple. You can contact your lender via telephone, visit them in person, or go online and request a payoff amount. When your loan is paid off, your lender will send the lien release to the DMV. Understand car loans, including what to do before applying, interest rates and APR, and what you can negotiate. If you are a finance customer, please mail your payoff to the following address: Mazda Financial Services PO Box 74689 Chicago, IL 60675-4689. USPS Federal Credit Union is open to Postal Service employees and select groups within 50 miles of a branch. Offering loans, savings, and checking accounts.