An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. The Illinois bill of sale form approves the exchange of a financial consideration for an item of property into a text register.Motor Vehicle Bill of Sale Drafted upon the sale of a used vehicle to provide evidence of the transfer of ownership. Motor Vehicle Bill of Sale – Use to sell, purchase and change ownership of an automobile. Forms on this website are PDFs with fillable fields. Forms should be downloaded to your computer before filling in the fields. This is the motor number or serial number required for identification purposes. When selling a vehicle, you will need to provide the buyer with a bill of sale form. The builder will ask you to fill in the buyer and seller information and motorcycle information. Step 3 – Review, Print, and Sign the Form.