My position to change the fluid every 50,000 miles has nothing to do with the recommendations of BMW or the builder of the transmission.

Changing the fluid and filter every 50,000 with the original fluid is simply logical from a preventative standpoint.

It doesn't mean never changing the fluid is wrong. I do think it is not a proactive tender loving care approach to a very hard working and expensive transmission.

We accept engine, differential, transfer case, power steering and brake fluid should be periodically changed. I see no logic that transmission fluid defies the accepted replacement of other fluids.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas