When you are looking to trade in a car it is wise to get the blue book value before you head to the dealer. This will tell you what the car is worth based on it’s age, mileage and general condition. Don’t think that you will get the blue book value on a trade in though. The dealer has to be able to make money from your car as well so expect half or a little better. If you don’t like that deal then try selling it yourself.