5W-20 has always been on the list and 5W-30 was approved on the up-date that came out about a few months after the 2007 introduction of the NAH. I have yet to find a Nissan dealer that has 0W-20.

10W-30 is still not on the recommended list, but will not harm your car as it is approved for the normal 2.5 engine. You will have a slight loss of MPG. The only thing to be careful of would be the mix of synthetic and normal oils.

0W-20 is not recommended for heat above 100 degrees (if you read the bottle), so 5W-20 is actually better for the summer if you are in a hot area.