"Your old car's not worth that much"

Car dealers make little, if any profit, selling new cars. Used cars, plus the service department, are where the real money is. That's why car dealers are so interested in your trade-in.

It's up to you to get a good, realistic sense of what your trade-in is worth. Web sites like Edmunds.com and Kelley Blue Book's KBB.com can help before you go to the dealership and to negotiate a good deal for it. If you're not satisfied with what the dealer is offering you can get more by simply selling the car yourself.

Last updated June 23 2011: 6:33 AM ET
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