Auctions are risky propositions even for the professionals. Please note that all salary figures are approximations based upon third party submissions to Indeed. Which Cars Offer the Largest Rebates? Along with loaning you the money to buy your car, they want to sell you an extended warranty, gap insurance, undercoating, fabric protection, and anything else you can think of. If you buy a new car or a certified pre-owned car , it comes with some kind of warranty from the carmaker.