Quote:
Originally Posted by Bullitt
My car runs with the CSF radiator + the auxiliary water cooler, and there is zero protest from the ECU. Engine is N54 with MT.
I'm guessing it must be the programming for N55's and automatic transmissions...
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Likely true. But N54 also runs hotter so in this case that helps. My 335i is N54 AT and also has a CSF rad and dies not have the issue.