Officialy MB says life time fill, however if you check with any dealer they will have fluid, filter, & needed parts in stock. Doesn't come with dipstick, so special tool is needed. IF I owned any car (truck) with this trans it would get serviced every 45K-60K miles. $200-225 for service sure beats $4000+ for replacement. Part number for dipstick is
140-589-15-21-00 & SHOULD COST ABOUT $30.

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