It is perfectly normal for oil mist to be carried over past the turbo and into the inlet track, what you don't want though is a lot of oil......a diesel engine will self destruct (run away) if it has a decent supply of oil to feed off - which is why I don't think yours is burning oil on cold start.
A blueish smoke can also be a diesel fueling issue on cold start, aren't new injectors supposed to be calibrated with the ECU etc ??
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2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
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