the sensor oil is still an issue. From what I understand, it takes multiple cleanings. However it does go away. Cleaning the sensor does not void the warranty. People have cleaned it a few times and then sent it back to Nikon. Also when servicing it through nikon I was told they attempt to remove any excess oil.
Overall, I would not worry about it. It's an awesome camera.
Next time when you order gear, try to go through the links on my site as it helps me support my reviews. Either way, glad you are happy with it. I am happy with mine. I will keep you posted when I perform my next cleaning. After the first cleaning, the oil residue is not as significant as it once was.