I agree with post #3. It's way too critical to guess at the source of the problem. Jack up the front end, get under there and do a complete inspection of all the tie-rod ends, ball joints, suspension arm pivot bushings, and brake-reaction rod mounts (I forget what Mercedes calls them). It doesn't take all that long and then you'll know what's good and what's bad.

If you do a Google search I'm sure you'll find lots of photos/diagrams of what each component looks like.

You'll need a kid assistant to pivot each wheel back and forth in both planes (9 o'clock-3 o'clock, then 12 o'clock-6 o'clock) while you lie under the car with a flashlight watching for movement at each joint.

Also don't overlook dumb stuff like loose lug nuts, loose wheel bearings, etc.

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'81 300CD - 180K, cannot be killed by any conventional means
'99 Ford Escort - good MPG