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I've run with the water-oil heat exchanger in 90-degree weather (sunny, humid, in the mountains) without a problem. I also installed a 135i instrument cluster so that I can monitor my oil temps (I don't care much about coolant). They never crested 240 on Summit Point Main (a fairly fast track), and never passed 250 on Summit Point Shenandoah (MUCH more technical, not much straightaway time for good cooling). It's been a good upgrade, and it also means you don't have to do bumper and fender work to fit in an air-oil heat exchanger...
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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