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Originally Posted by alano
That's generally where most of my searches led too....no real reference linking it cold weather though. Also, I thought the oil seperator issue was resolved on 2004 and newer engines?
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Then you must not have read the threads, as the main cause is condensation build-up in cold temps. If you drive short trips, this will not allow the engine to get up to temps enough to burn the condensation - which then freezes and clogs the system.
BMW made a cold temp kit that has insulating wraps for the hoses.
Search again .. you missed it.