Modern ATF has additives which are not good for your power steering. Go the parts store and buy some power steering fluid. It is expensive, but much cheaper than power steering components.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles