The trade in value is irrelevant unless you compare it with the new car cost. They might give you a great trade-in, but then charge you MSRP on the new car. Or the opposite, give away the new car and offer you a crappy trade-in.

If you are thinking of simply selling the car to a dealer without buying a new car from them, that's when you really want to bend over.

__________________
2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver