Nissan's OCIs are very conservative for modern lubes. If not worried about the warranty, 5k (or longer in some cases) will work great for most DDs. If you drive hard and/or live in a hot climate, you might want to go with more frequent changes, but modern lubes are pretty damn tough.
If you're that OCD about it, Jar's UOA suggestion is the way to go. Overkill for a DD (unless you suspect abnormal wear, eg, an older, high-milage engine), IMNSHO, but if you helps you sleep at night, why not?
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