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OTOH we had a owner with a E300D with the 722.6 who was a travelling salesman, put over 300K (in the course of only a few years, normal for this guy)on it without ever servicing the transmission. He traded it on on an ML and a service writer at the dealership bought it, continued to drive it over 50,000 additional miles, he then went to a different dealer so I lost track of the car. Trans was never serviced.
I therefore have the opinion that either your trans is a good one and will last or it will bite the dust earlier than this, regardless of if the oil is changed. My opinion ONLY on the 722.6, if it is an earlier trans it should be serviced according to the service schedule.
The color of the oil has nothing to do with the quality of the oil, it turns black due to graphite friction discs, it is fine even when black.
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