Its not a sealed for life tranny. Was, isn't any more and hasn't been for many, many years.

Current MB recommendations for the last 5 yrs or so is to change every 39K miles. Uses a syn fluid with a specific spec. Read up on it.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)