I just don't get messing with a transmission cooling system when one is not a trained ZF technician and there is not historical data that indicates overheating has been a problem certainly not a chronic issue.
I understand trans coolers are used in some applications but that doesn't mean it is good practice on other brand vehicles, as much chance it is a bad idea as a good one. In the discussion, comments bounce around different transmissions so there is no consistency of input to even a given transmission.
Be sure to go back and read JCL's input early on about ZF transmissions---per the forum threads overheating has not been a problem. I agree with his observation and that is also my personal experience with all 117,000 miles in Texas.
My suggestion is to spend the money on something else like PM or the rest of the cooling system if not in great shape.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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