The power steering gearboxes take ATF. The some of the newer cars call for MB P/S fluid. The E-Class cars 1996-present take either MB p/s fluid, part #000 989 88 03, or one of the approved Dextron III ATFs. The CLK-Class also can take either fluid. The rest of MB cars require MB p/s fluid or p/s fluid from Pentosin. Again though, for 1983 ATF will be fine. Your owner's manual will list what is to be used. If you want the list of approved ATFs, I have that. I just received the "Factory Approved Service Products" list from MB.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section