use ATF for the fluid. It's only in some recent models, like 2000 and newer, that some MB models require a specific P/S fluid. This is according to the MB "Approved Service Products List", Nov. 2001.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member