I know I have a different car, but with my w126 I had developed a pretty bad steering leak. It had gotten pretty bad after about 117k. I purchased a salvaged steering box, $150 compared to $575 new, so I went with it. After installation, I noticed a slight play in the wheel. I have asked the dealership about tightening the box and they advised they quit adjusting them because of all the problems in the boxes when attempting to adjust. I guess in my situation, the play is better than the leak. My opinion is that the gear inside the box is worn some and the only way to fix is to replace with a new box. Hope this helps.