Its my understanding that all MB automatics have a torque converter drain and that it should be used for a complete fluid change.

Both my 300's have had this ('79 & '87) and my mechanic always drains the converter as part of the tramsmission service. I know this because I watch him service the car. Its nice to have a mechanic that will let you watch everything that he does.

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current Benz
'87 300TD (white) 168K (on the odometer as of 15 April 2004)
past Benz owned & miles I put on them
'62 190D 20K (white)
'63 190D 20K (beige)
'65 190D 35K (white)
'73 220D 175K (metalic green)
'79 300D 135K (metalic blue)

driving a Benz diesel since'77