Yes after I posted I looked at the previous posting dates and realized I should go to bed. One technique for changing out tranny fluid owners of large RV developed was to, change out filter, then undo the return line from the tranny cooler and drain into a bucket while filling with new into the other return line section-with help from someone idling the car while this oil change circus is going on. It at least allowed the closest thing to 100% oil change. This involved transmissions with 18 to 25 liters capacity-but it is just as important for our cars. Anyone ever put forth this changeout technique?

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On the Alberta Prairie with 2001 X5 4.4i, 2001 540i