retain it's value? Should I consider trading it in for a new model bmw, or keep this car? There is nothing wrong with this car, but I do not have much more to pay on it, and yet I do not want to lose to much value when I do trade it in for a new model.

These 7 series cars depreciate rapidly. Punch out as soon as you can and no longer than 80,000 in my opinion. If you want to trade, it's really now or never.

if it was 78 it would be something
2002 bmw is like having a empty coke bottle garage is full of them noone wants them

Gas price could hit $5 a gallon pretty soon. You should keep that in mind before you decide to change your car.