Maybe the car's a '95? If so, that was the last year of the venerable W124 chassis, and has an M119 4.2 motor in it. Geat motor, great car, no real endemic problems to speak of beyond normal wear-and-tear stuff. That car's a highway star, with real tall gearing. There's a write up of that car in the "Featured Cars" section of this Site...check it out.
Best regards, Michael