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I've not heard anything of B58 oil pump issues here in Alberta, with thousands of vehicles in the BMW line up using them here and operated in temperatures down to -40C or so in the winter.
Although the engine may be started with oil at -30C, the oil is at 0C within 2km or so of starting, at +50C within 6km and +100C within 10km of a cold start at low temperatures, all with gentle driving until the oil is fully warm.
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