Can I withdraw an offer on a car?

With a dealer, an offer usually isn't binding until you sign a purchase contract, though a deposit may have its own refund terms, so read them. Tell the seller in writing that you're withdrawing. On OffLot, a newer offer on the same vehicle replaces the old one, and offers stay open through the end of the month. In OffLot's preview, nothing is binding and no dealer is notified, so there's no obligation from an offer.