Online auctions are the new kids on the block for selling cars. Although there are several sites that handle online car auctions, eBay Motors at . com is the most widely used and recognized. An online auction allows you to reach a wide audience of potential buyers, is less costly than sending a car to a live auction, and combines many of the best features of a private sale with sending a car to auction. For tips on selling your car online and using the online auction process, call the Ask Hagerty Concierge Service at 888-310- 8020, menu option 3 to request.