Per the MB "Factory Approved Products Service", Mobil ATF be it conventional or synthetic IS NOT listed as an approved ATF. With that said, I have it in my TD's tranny, but I did that before I got the list from Mercedes. When I read the list, it definetly raised an eyebrow with me. I was VERY surprised to not see Mobil/Mobil 1 listed. As a matter of fact, no synthetic ATF is listed.

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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