That is the exact time to expect the seperator to fail, cold or not. I have posted on this before. The seperator system is of a design that requires parts be replaced instead of a built in, permenant system that arguably works less well.

I doubt there is a model wide recall, but plenty of these have been done under warranty.

Yes, things are going to start breaking at 70k. The cooling system will probably be next; waterpump would be my guess. Though I am at 80k and haven't had to do either yet. But I will.

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2001 E53 3.0 5pd