Last time I looked into it there was evidence that Nissan uses or has used a Motul derived oil. I can't find any of the links (with a quick search). I don't know if this is fact, like most keyboard warriors I am only repeating what I have read.
Any decent semi-syn or synthetic oil with around 10w-40w will do the job fine as long as you service the car with sensible intervals. With the low cost of oil testing it is worthwhile sending a sample away if you want to know what is happening inside your engine.