FYI, I just spoke to MBUSA customer service, which said on the ml320 from 1998-2004 MB does not recommend changing the tranny fluid at all.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)