When JATCO designed the new tranny it assummed a bigger role in warranty, thus they created a special formulation ATF and required its use in their transmission before they would honor warranty pass thru from Nissan.
http://www.jatco.co.jp/ENGLISH....html
Besides being a decent hydrolized synthetic it has special additives to control different slip stick ratio of the new dual lockup clutch. Until the new 5AT Nissan AT all had single lockup clutch!AT your own risk you might try adding Lubeguard BLACK in varying ratios [start with half 5-6 ounces in 10 quarts of Mobil 1 Syn ATF.
All you have at risk is tranny failure.......the color will give you away if warranty is a concern!
Remember dealers markup parts cost by 100%.