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Also, the OF housing itself is the same as the 135i (335i), which means it can mount a plethora of OEM and remote oil cooler options.
I plan to use the O-W heat exchanger because fluid-to-fluid heat exchangers are (relatively) efficient and the stock one is sufficient for my needs. If I didn't have a SULEV, I'd get a high performance, all-aluminum radiator (because).
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