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Message: <blockquote data-quote="Dave_W" data-source="post: 91534" data-attributes="member: 9521">I suspect it is a combination of shutter particles and oil, similar to the D7000. After I had the catastrophic shutter failure on my D800 and oil on my D7000,  I've come to suspect Nikon is experimenting with shutters and shutter mechanisms that has not either been tested thoroughly or are manufacturing tolerances are too loose and many are getting into cameras that should have been rejected. As for D600's with this issue, consider doing what many of us did with our D7000 - send it to Nikon and they will replace the entire mirror box with one that does not leak oil/particles, as well as thoroughly clean your OLPF for free. And here's where buying your camera at a local dealer pays off because they'll send it in for you, thus no out of pocket costs for you.</blockquote>