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Kaane Kaane is offline
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Posts: 7
Join Date: Aug 2015
Car: 2008 535i
Default 12-30-2018, 09:58 PM

The factory cooler serves 2 functions, 1 to cool the fluid, but it also is used to heat up the fluid and also to keep the temperature fluctuations down. If you just replace the factory setup the warm up for the transmission will take a lot longer and also temps will go way high during stop and go traffic. I would supplement the factory setup not replace it. Most people that install additional coolers leave the radiator setup alone.
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