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How to negotiate when you have something to give back?
NEVER combine the negotiations for trade-in of an old car and purchase of a new one (and/or financing), if you can avoid doing so. Dealers are very good at trading off one against the other to increase their total profit, and it's harder for you to walk away when you have to discard the whole thing. These are separate transactions, each of which can be done with other parties.  Treat them as such.