Yeah that sounds just like the car I was going to buy.
89k mi. silver 500E (93) - $24k.
I didn't buy it because it had more rust than my 20yr old 300CD underneath it (mine has always been a NE car too). It also has some rust starting to form on the body.
The transmission shifted a little hard (fluid was brown in color) and the brake fluid was overfilled and black in color.
Those things alone were enough to put me off...
Good luck with you car...
if I was you..
I'd....
go to a dealer, pull a VMI, pull a Carfax
take those to your mechanic and have him look at the car for body repairs and the car itself mechanically!
hope it's a nice one!!! I envy you