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I thought the spots were oil spots...not dust. You can manage dust, but if oil is getting splashed onto the sensor...that is a different, and much larger problem.
OK in the automotive world, when you have oil spots in your parking garage, that means your car is leaking oil. That means the engine you are running low on oil and something will go KABOOM eventually.
So with all these oil spots splattering inside the D600, my question is the part that required lubing is probably running low on oil. Which means failure of that part someday? I wonder what part that is?