What is the condition of the exterior and interior of the car?
Most used cars will need fluid and filters changed. These are regular maintenance items and wouldn't really affect the value, IMO.
Tires might fall into this category, too.
Is the wiring harness so bad that the car is having drivability problems, or does it need to be changed because you know that all M104 engines from 93-95 have defective harnesses?
Kelley Blue Book gives a private party value for this car in "good" condition as $8525.00
Dealer trade in value is $6350.00
Just a guide....
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".