The Federal Trade Commission's (FTC) Used Car Rule requires dealers to post a Buyers Guide in every used car they offer for sale. The Buyers Guide must tell you: 1) Whether the vehicle is being sold "as is" or with a warranty. 2) What percentage of the repair costs a dealer will pay under the warranty. 3) That spoken promises are difficult to enforce. 4) To get all promises in writing. 5) To keep the Buyers Guide for reference after the sale; 6) The major mechanical and electrical systems on the car, including some of the major problems you should look out for. 7) To ask to have the car inspected by an independent mechanic before you buy.