The trade-in is the most undernegotiated part of any car deal. Though many informed car buyers follow the rule of adding the trade-in at the end of the negotiations, that is not the only secret to negotiating the trade. Yes, that keeps it separate, but does it guarantee the highest trade value? Absolutely not. This is important to remember the next time you venture out to trade the old for the new -- and one of many reasons to consider the services of a car buying service such as Car Pal!