I am still looking at backup camera options, and thinking I need to go in the direction of another FF. I have only briefly followed the oil spot issues that the d600 had and I know they fixed it in the d610. The price on the d600's though, are pretty tempting as a backup/second body. If I order from KEH can I assume the oil issue has been fixed? Hypothetically, if I get one and it has the oil issue, does anyone know if Nikon will still repair it if I am not the original owner of the camera?