yep I have some oil spots at smaller apertures. (had a K5 before and Pentax replaced it as it had a sensor stain- Nikon are crap from this point of view). Will probably wet clean it and see what happens- I have heard that the problem dissipates after a few thousand shots. I'll give it a clean and see if it returns.
I use my camera a lot and racked up 10's of thousand shots I have had to clean my sensor about every couple of thousand shots, sometimes it's just one or two and mainly not to noticeable unless at higher F stop than F11. I always carried a couple of sensor swabs in my bag, unfortunately I only had 2 in my bag on a recent visit to the UK. I must have had oil on the sensor because the first swab just smeared the oil. I then used the second to try and reduce the smear but it still left marks on the sensor !!!! This was the final straw. So on my return I contacted Nikon and sent sample images, they were good and within 2 days they sent me the postage paid sticker for a return service.
Now thats just my experience, however yesterday ( the day I sent it) I also received an email which I have copied at the bottom. So bottom line is although they do not admit the oil issue they are finally going to do something now. So D600 owners can now hopefully get their cameras sorted. Although please wait a week or two so they can fix mine first ;-)
Nikon Inc. is contacting you regarding your D600 D-SLR camera. As you may be aware, Nikon Inc. recently issued a Technical Service Advisory for Users of the Nikon D600 D-SLR camera.
This Advisory related that some users of Nikons D600 D-SLR camera have reported the appearance of tiny spots on certain of their images. Not all users have experienced this issue. Nikon has thoroughly evaluated these reports and has determined that these spots are caused by dust particles which may become visible when the camera is used in certain circumstances and/or with certain settings. It is a well-known fact that the presence of dust particles cannot be completely avoided when using a D-SLR camera even after normal sensor cleaning procedures, because of a number of factors including components moving at high speeds when images are taken, the use of interchangeable lenses and the different environments in which a D-SLR camera may be used. As part of its customer-service commitment, Nikon is providing a customer-service measure to reduce the potential impact of dust particles on images taken by its D600 D-SLR cameras.
Nikon has resolved this by making available to you (even if Nikons product warranty has expired) this customer-service measure, which includes the inspection, cleaning and replacement of the shutter assembly and related parts of your camera, FREE OF CHARGE as well as the cost of shipping your D600 camera to Nikon and its return to you. Once again, please understand that regardless of this service, your D600 camera as is the case with all D-SLR cameras, will continue to require normal periodic sensor cleanings.
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http://nikonrumors.com/2013/02/22/nikon-issues-official-statement-on-the-d6000-dustoil-issue.aspx/
Now thats just my experience, however yesterday ( the day I sent it) I also received an email which I have copied at the bottom. So bottom line is although they do not admit the oil issue they are finally going to do something now. So D600 owners can now hopefully get their cameras sorted. Although please wait a week or two so they can fix mine first ;-)
Nikon Inc. is contacting you regarding your D600 D-SLR camera. As you may be aware, Nikon Inc. recently issued a Technical Service Advisory for Users of the Nikon D600 D-SLR camera.
This Advisory related that some users of Nikons D600 D-SLR camera have reported the appearance of tiny spots on certain of their images. Not all users have experienced this issue. Nikon has thoroughly evaluated these reports and has determined that these spots are caused by dust particles which may become visible when the camera is used in certain circumstances and/or with certain settings. It is a well-known fact that the presence of dust particles cannot be completely avoided when using a D-SLR camera even after normal sensor cleaning procedures, because of a number of factors including components moving at high speeds when images are taken, the use of interchangeable lenses and the different environments in which a D-SLR camera may be used. As part of its customer-service commitment, Nikon is providing a customer-service measure to reduce the potential impact of dust particles on images taken by its D600 D-SLR cameras.
Nikon has resolved this by making available to you (even if Nikons product warranty has expired) this customer-service measure, which includes the inspection, cleaning and replacement of the shutter assembly and related parts of your camera, FREE OF CHARGE as well as the cost of shipping your D600 camera to Nikon and its return to you. Once again, please understand that regardless of this service, your D600 camera as is the case with all D-SLR cameras, will continue to require normal periodic sensor cleanings.