If you have worn-out cars you plan on selling, there are more than a few ways that you can make supplementary income. One such means is by putting up your car up for bidding in an auction. There are several things you should bear in mind when you participate in a car auction, however. You should be able to give your car the right amount for a reserve price. This price is essentially the lowest bid. You should think twice about setting too high a reserve price as it can discourage some bidders. It is essential therefore for you to get the assistance of professionals, when setting a reserve.