Here's transmission fluid capacities for the 722.0, 722.1, 722.3, 722.4, and 722.5 transmissions. These transmissions were used on most MBs from 1968 until 1996.

See the link below on how to check your transmission's serial number to see what 722.x transmission you have.
http://www.dieselgiant.com/mercedes_engine_and_transmission.htm

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.