$3K is the going rate for that year in good condition.

Things to watch out for with that mileage in order of expense + labor:

Head gasket ($1500-$2000 if head machining is involved)
A/C Evaporator ($1800)
Coolant Pump ($750)
Engine Harness ($600)
Radiator neck ($300)

Hopefully, many (if not all) have already been taken care of.

Good Luck!

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car