The DPF does a good job of hiding any smoke. Mine barely smokes at all despite burning through 2 litres/1000 miles, last week it went straight through the MOT with only emissions readings.
High blow-by means more case getting into the crankcases therefore more gas passing through the breather back into the inlet. As the gas speed increases oil more oil gets carried with it as it doesn't have time to be separated and drop back into the pan.
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