I am a fairly new owner (done just over 1000 ks) and have noticed this black soot from new (white car). It's not bad enough to annoy me at this stage and I love the car.

In my previous profession I was somewhat of a particle fallout 'specialist'. I examined the 'soot' from my car under a microscope and I can confirm that it is typical to the emissions from all motor vehicles albeit in much greater proportions from my GTI. There is certainly no evidence of oil. My oil level has gone down just under 2mm on the dip stick from new and I still don't know if my motor is going to be one of the excessive oil burners.

Do other petrol turbos eg Subaru WRX emit this soot in similar proportions to the Polo GTI?