I have owned the D80, D200 and two Fujifilm S2 digital cameras and have not had oil issues like the D600. In fact, I only had to deal with dust on the other models. This is oil. No amount of blowing with a Gitzo makes any of it disappear. Nikon is getting a call from me. I wet-cleaned my sensor ten times last night to get the oil off in the same portion of the screen, the left side of the frame from top to bottom. It is stubborn and should not be there. I wonder if the vibrating self-cleaning mode loosens up the oil more? If this was dust it would be randomly placed on the AA filter. It's not. It is the same area. I think Nikon needs to step up and fix it. I am happy with the product somewhat but this shows Nikon is over their head in handling problems. This shouldn't happen with a giant that has such a loyal, if not gullible, following. Count me as one of them.