If it utilizes the same type of filter as my wife's Sentra, it's just a biga** screen that doesn't really catch fine particles. Install a Magnefine filter on one of the cooler lines.
By ATF D, do you mean Nissan Matic D?
If so, some users have stated any Mercon V fluid is an upgrade (and Mobil 1 is recommended for Mercon V). I believe Nissan says DexronIII/Mercon can be used if Nissan Matic D is unavailable, and since Mercon V replaces all Mercon applications, you'd be using a correct fluid.
Amsoil ATF is recommended for Nissan Matic D and has done well in my wife's Sentra.