I believe it’s word of mouth that people say ns-3 is backward compatible.
As I was always curious about this, because thinking ns-3 is newer and always better,
But I believe I saw some factual chart that was posted in this forum that said ns-2 is specifically for the older vehicles and ns-3 is for the newer generations.
You would think they phase out ns-2 in favor of the new improved cvt fluid.
But I’m sticking with the old stuff for my old 1st generation unless told otherwise.
I still have a batch for another drain and fill. Honestly I’m contemplating using aftermarket ones that exceed Nissan specs.
I’ll cross that bridge when I get there!