You don't have to buy the fluid from a MB dealer. The fluid is made by Febi. It is available through Fastlane I believe, or any of the other on-line MB parts places.

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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