MV-912: Vehicle Bill of Sale (PDF). English. Use this form to show proof of a vehicle ownership transfer through a private sale. Download.A New York motor vehicle bill of sale provides proof that a motor vehicle has been legally sold and acquired in the State of New York. Below, we've outlined the five steps and forms required for how to sell a car in the state of New Jersey so you can sell your car quickly for the most cash. The official website of the New Jersey Motor Vehicle Commission. Title and register a new vehicle or transfer vehicle from another state. A bill of sale is advisable for this transaction.