Now to the topic Sensor dirt ....
After about 3500 trips then came the first dirt.
Have not bothered to clean itself.
Online at Nikon a Service Point located, explained problems and printed package label.
On Monday at DHL delivered and on Wednesday I had my camera back. Superfast and has cost the fun 0, 00 Euros.
Was changed nothing, it was just cleaned thoroughly.
Lens on it, aperture 32 and going on ....... the result was a tiny spot, which was no longer visible even with aperture 22.
This spot I could blow away easily.
After about 5200 trips two small spots have been seen again.
This I have done away with 99.5% methanol and Q-tips. Everything went without any problems.
Now it has about 10,000 trips. Except for normal dust I had no more oil stains ......
I have not regretted the purchase and will probably still long fun with my D600 have.
Too bad that Nikon has just thrown a new model on the market ...... so falling prices for the D600 ....