KBB has a value evaluator where you put in all the details of your vehicle (including region) and it gives you trade in/private sale values based on excellent, good, fair, poor vehicle conditions.

FWIW. The age (12 yrs old), location (MA, an all wheel drive SUV in the NE will have deminished value, seeing it's the go to when the weather gets bad), overall condition (oil leak and limited tread on rear tires) and mileage(150k) will keep the value in the sub 7k range. Also most upgrades are not "value increasers" (it's almost impossible to find a buyer with similar taste/willing to admit it and pay additional).

IMHO, The 9k value noted above would be for a needs nothing, 9 out of 10 in and out, unmolested, NM or AZ car.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!