Oily/Diesel smell in cabin
I have had similar issue and exactly the same car ('13 D4 AWD SE LUX), but it is more noticeable when the Aircon is on auto and recirculate. I will occasionally notice it when I come back to the car and I've left the vents open and the engine has been off but cooling down. It is not always there, and on somedays, there is no smell at all.
Previously on this forum someone suggested that there was possibly a leak in the gearbox seal and the fumes were coming up, but I have not found this but I have not found this..
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