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      09-14-2012, 07:19 AM   #5
ajm8127's Avatar

Drives: '07 335i
Join Date: Aug 2012
Location: Pittsburgh

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Originally Posted by enrita View Post
i am talking about AT oil , not engine oil
I've been thinking more and more about this recently. I don't see why it wouldn't be possible to bypass the ATF/water heat exchanger and mount a dedicated ATF cooler in front of the drivers wheel. A thermostats such as Earl's 501ERL could be used to keep the temperature in the operating range. I don't know this for certain, but I would have to assume the engineers at ZF designed the transmission to operate with the fluid above ambient.

My car did not come with an oil cooler so I plan to retrofit one as outlined here:

This same approach should work in front of the drivers side wheel for an ATF cooler.

I agree the best thing to do to protect the auto tranny is to keep the fluid temp n check.