According to EverythingBenz - Mercedes-Benz Forum and Web Search Using Google the transmission is a 722.662. I have no experience with these newer transmissions but this forum and others is full of related threads

Here are some to start you off

PeachPartsWiki: 722.6 Transmission Fluid and Filter Change

http://www.peachparts.com/shopforum/ml-gl-g-wagen-r-class-unimog-sprinter/259116-722-6-transmission-fluid-change-pictures.html

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!