I just had the local MB dealer service my C43 transmission at 60,000 miles: $130 (labor, filter and pan gasket) plus $70 for transmission fluid for a total of $200.

I would view the sealed "do not service" transmission like the 10,000 mile FSS oil changes.

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'98 C43 AMG
'88 420SEL
'93 190E Limited Edition (including factory Sportline package)