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      09-24-2012, 10:49 AM   #20
That's what she said...
bigjae1976's Avatar

Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

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2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
Originally Posted by VictorH View Post
I thought I had read elsewhere that you had to run the DCT pump to drain more fluid and that was only something the dealer could do (but wouldn't since it's "lifetime"). Is this true or not necessary. I guess if the net yield was only 0.5L or less that I would skip, but do you know if that's needed or not?
I do that in my automatic M3 (Mazda3!). I brim the tranny with fluid. Remove the tranny cooler return line and then turn on the car. Shift from P to D a couple of times and then the tranny pumps out the fluid trapped in the cooler line. That will drain 3 extra quarts of ATF. Note that I overfill the tranny because you do NOT want to run the transmission dry.

I would imagine that it would be a massive PIA to do it like that in the DCT. Pumping extra liters into the DCT would be tricky, time, consuming, and (if on jack stands) very tiring. If you get 5L of 7.8L by a simple drain and fill, that's good enough for me.

My Mazda takes 6 qts of ATF, 3 of which is in the cooler and lines. So its worth it and its easy to add extra ATF in the dipstick tube.

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