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Well, would have been good to do what MB Doc mentioned, did you check the level?
The fluid will get quite dark without affecting shift QUALITY, but the level is critical.
If you aren't seeing any abundance of chips, shaving, metal flecks, or graphite sludge, you could try the fluid and filter.
A little worried about the status of the transmission, because if it wqas replaced or rebuilt, why wouldn't the fluid be clean?
It does get blackish due to the graphite friction plates. But not in a year or two for example. I would even go so far as to say that the blackness is no reason to change the fluid, that's what MB says too, I can find a link to something I posted here years ago regarding fluid.
It is special MB fluid though, don't cut corners, get the right stuff. That could be a problem as well, incorrect fluid.
The fluid checking procedure is a bit tricky too, some DIYers have ways to check it that they are comfortable with. To do it the MB way you need a shop computer, and you definitely will need a dipstick (special tool but not too pricey).
Gilly
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