Here are some useful steps to follow: If you buy a used vehicle from a private seller, the seller may ask you to sign a purchase contract, which is a very simplified form of car purchase contract. It is necessary for sellers to have proof that the vehicles are no longer in their possession if the vehicles are to leave or be involved in hit-and-run accidents. It also serves as a “pink sheet of paper” for buyers until the documents are completed. The disclaimer of warranty clearly states that the purchase is made “as is” without any additional warranty (from the dealer). As stated in the disclaimer, not all manufacturer warranties are “party” to the dealer, and you can use them wherever the manufacturer supports them, not just the dealer where you make your purchase.