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I am not sure about the '97 and older, but the '98-'06 had the 722.6 trans (E class). I have done at least three 722.6 fluid changes, and agree with changing the adapter plug. Part # 203-540-02-53. I have had great success using compressed air to force the fluid out of the converter through the cooler line. I usually get out about seven quarts total. It gets a little messy, but well worth the effort it takes to get most of the old fluid out. I believe the 722.6's do not have a converter drain plug after'03. I did a '99 E300, and it had a plug. I have also talked to several transmission experts (Marc at Sun Valley being one of them) that say Valvoline Max Life Synthetic ATF is compatible. It is a good alternative if the Shell 134 is not available. There are youtube videos of changing the adapter if needed.
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