Nissan and Datsun Workshop Service and Repair Manuals

Fluid - Differential: Testing and Inspection
Checking Differential Gear Oil

Checking Differential Gear Oil

Check for oil leakage and oil level. 

Filler plug:

Front
Tightening Torque: 39 - 59 N-m (4 - 6 kg-m, 29 - 43 ft-lb)

Rear
Tightening Torque: 59 - 118 N-m (6 - 12 kg-m, 43 - 87 ft-lb)