MB's current recommendation is for 722.6 ATF and filter to be changed once at 39k mi.
Previously was considered "filled-for-life".
I'd change it (not flush it) and continue to change it at an appropriate interval.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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