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      09-04-2017, 11:05 PM   #2
WhatsADSM
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Drives: 2011 135i
Join Date: Sep 2013
Location: Milwaukee

iTrader: (2)

Honestly if it ain't broke don't fix it. I would use whatever the oem fluid is personally. The issue isn't really the fluid so much as the temp.

Have you considered adding a trans cooler of some sort? Not sure about how the ZF trans in the 128i is setup. Is there any cooler in there now?