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Honestly I don't quite understand the obsession of this community with oil coolers, oversized oil coolers especially. I have seen some aftermarket kits for n54 engine with oil coolers bigger than what you have on actual race car. If this was needed BMW would have done it first but instead they opted for additional coolant radiator for larger heat transfer area. Also, oil needs operation temperature from 100* to 115* thus the need for oil thermostat that regulates the flow, from closed to partially open to fully open. On the track when engines runs for 20-30 min then sits for 45-60 waiting on other groups, then runs again, an oversized oil coolers with modified oil thermostats might introduce too much water vapor in the oil system from condensation, and oil containing moisture doesn’t flow or lubricate properly. Should I mention oil pressure drops due to oversized oil coolers? I'm yet to come across some numbers on that.
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