The MB ATF fluid is probably full synthetic and is for the new cars. Your car can use regualr ATF or you can buy Mobil 1 ATF. There are about 13 "approved" ATFs, for use in Mercedes. Personally, I put in Mobil 1 ATF and Mobil 1 gear oil for the rear diff. I figure since these fluids only get changed every 30K, I figured what the hell.

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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