Another oil/dust/lubricant example from D600
This is a crop from the upper left quadrant of the photo - original crop approx 3000x2000, resized to about a third of that before I uploaded.
None of the spots move or disappear when doing the sensor self-cleaning procedure, and not even when using a blower - they are all stuck.
This is not exactly how I expect a sensor to look after less than 2000 exposures.
Called Nikon today and they 'had never heard of this issue'. Riiiiiiight I believe that. Not.
I will call them again tomorrow and hear if someone else there even dares to admit to this problem.