[water95]

You should be able to exchange your car for a new kind or color at the car dealership. And say for example you already have a car worth 10k and you want to exchange it for a car worth 14k then you only pay 4k for the car and exchange it for the car you want. But I you want to exchange for a cheaper car then all you have to do is exchange it, you don't get anymoney back or anything or you don't have to pay either.

10k-10k=Pay 0
10k-12k=Pay 2k
10k-14k=Pay 4k
10k-16k=Pay 6k
16k-14k=Pay 0
Etc........