Oil Leakage And Oil Level

WARNING: This page is about a different car, the 2005 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

Make sure that oil is not leaking from the transmission or around it.
Check oil level from the filler plug hole as shown.
CAUTION: Do not start engine while checking oil level.
Set a gasket on the filler plug and install it to the transmission. Tighten the filler plug to the specified torque. Refer to "CASE COMPONENTS ".
CAUTION: Do not reuse gasket.

Fig 1: Checking Oil Level From Filler Plug Hole
Courtesy of NISSAN MOTOR CO., U.S.A.