Hey guys,

My 97 S600 has a 722.6 AT and Alldata states the following:

"The Transmission Type 722.6 is filled with a newly developed special transmission fluid and is considered to be "filled for life". No other fluid is authorized to be installed in this transmission, This fluid is not to be used in any other transmission"

Is this really true? What are the procedures to change/flush the AT fluid?
Thanks.