I have had good results with Lucas power steering stop leak..

its about 7 bux a pint but it should do the trick after a few hundred miles...

used it in my 1990 300 D and after about a week or so the leak stopped .. this was a few months ago ,,

first i tried bars leak and it didnt work... drained everything out
and filled with 100% lucas stop leak .. seals have sweeled and no more leak!

well worth the 16 bux it cost me!!:p

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1994 S-350 6cyl Turbo Diesel 158k

1998 300d 6 cyl Turbo Diesel 143K

1993 2.5 124 Turbo-Diesel 236

1990 2.5 124 Turbo-Diesel 228k

1983 SL-500 EURO W/HEATED SEATS 40K

SOLD 1977 Jaguar XJ6 Coupe Antique Roadster 85K

SOLD 1993 2.6 6 cyl 190 E 150k

SOLD 1992 2.5 124 Turbo-Diesel 204k

RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH