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I wouldn't stress too much about the oil issue either. I have the D7000 (first run) and the oil issue was FAR worse than the images I have seen with the D600. It took a trip into Nikon for a cleaning (and a repair, the shop I took my camera into to clean the sensor put a scratch on the sensor) and I have shot 4k images since, all weather conditions, and not a single drop of oil. The repair stated that the extractor arm needed to be cleaned...
exactly - I had some pretty annoying spots on my D7000 sensor after 2400 exposures. I never really cleaned it, though - rubber stamp tool was just easier to do than to break down and order the wet cleaning kit. I now will do that, since I plan to keep the D600 much longer. I don't really care if it leaks oil like an old Italian sports car - the images are so much better than what I got from the DX body that I'm willing to put up with that for the price I paid for the D00 kit + all the other goodies Adorama threw in over the holidays. I just got another $80 coupon from them and bought me a nice ND100 filter with that, which will soon get tested with some MF glass.