Differential Gear Oil Leakage And Level

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Make sure that differential gear oil is not leaking from the front final drive assembly or around it.
Check the differential gear oil level from the filler plug hole as shown below.
CAUTION: Do not start engine while checking differential gear oil level.
Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer to "UNIT DISASSEMBLY AND ASSEMBLY ".
- Use High Performance Thread Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
  
  Fig 1: Checking Front Differential Gear Oil Level
  Courtesy of NISSAN NORTH AMERICA, INC.