When I brought our 740iL in for its Inspection II, I had the service dept. drain out the tranny and put in new fluid. The tech told me that at the present mileage (it had 52,000) it was a good thing to do....higher mileage wasn't such a good idea, because it could ruin the tranny. When the car hits 100,000 miles I'll have it done again, but we'll have the filter changed.
2001 Titanium Silver 740iL Sport
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