This free Car Sale Agreement sets out the terms and conditions upon which Seller shall effect the sale of the Vehicle to Buyer. This car purchase agreement template is a standard agreement made completely customizable for your individual needs.Filling out this Private Car Sales Contract is straightforward. In California, there is no authoritative return policy on used cars. Once a purchase contract is signed, it is difficult to reverse it. Writing an Auto Sale Contract. Write out your own full name, and that of the buyer. If you are an AOA member, CLICK HERE to watch a brief video that details the quick and easy steps. He definitely knows his stuff based on his experience in the car sales business. Gwen Markham, Oakland County Commissioner said she used to be on the Novi City. Council.