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      02-20-2011, 01:44 PM   #1
First Lieutenant

Drives: 2009 Crimson Red 135i
Join Date: Mar 2008
Location: Sterling, Va

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2009 BMM 135i  [4.75]
135i Manual Transmission Fluid Change

Just did the transmission fluid change on a 2009 135i with the 6 speed manual transmission, and took some pictures/video along the way. It's actually a very easy process to do. I used Redline D6-ATF fluid.

After driving it, I noticed that the shifter slides into gear more easily, and the notchy feel has been reduced particularly when it's cold.
I took the advice of 'wolfe' on this forum and took a sample of the old fluid. It certainly looked dirty after about 20,000 miles. Both the old and new fluids seem very thin compared to typical gear oil (like 75W-90) just from how fast they drain.

Hope someone finds this useful - comments welcome!

2009 135 Manual Transmission Fluid Drain and Fill