@ard: Using the dealer since it's still under the CPO warranty...otherwise I'd take it to the great local private shop where I get my oil changed (he's a Bimmer specialist). As to the washer fluid, no need to use the low-temp stuff where I live. It doesn't go into the 30s very often and my garage never gets colder than 50.

@bawareca: I looked at the charge pipes as I originally suspected that, but the oil has been deposited right between the exhaust and charging side of the turbo visible next to the heat shield and is leading me to think an oil line fitting it loose