I took about 20 minutes, and didn't find an answer in my "STAR Classic Service manual library".

I know these cars are supposed to have PS fluid filters. I just don't know where they are.

So.. having said that... I'm ASE certified, and dont' know the answer. I guess I need more MB experience.

I'd say for now, get out the turkey baster, and drain, fill, run for a minute and repeat until your happy.

Certainly, I will confirm, putting a wrench on that pinion bolt would be wrong.