Suzuki Wagon R Manual page 1474

7F-4 REAR DIFFERENTIAL
On-Vehicle Service
Oil Change
1) Before oil change or inspection, be sure to stop engine and
set vehicle horizontally.
2) Check oil level and existence of leakage. For checking oil
level roughly, lower point of level hole can be assumed to be
standard point of level. If leakage is found, correct its cause.
3) Remove level/filler plug (2) and drain plug (1), then drain old
oil.
4) Install new gasket to drain plug and tighten drain plug to
specified torque.
Tightening torque
Rear differential oil drain plug
(a) : 55 N·m (5.5 kg-m, 40.0 lb-ft)
5) Pour proper amount of new hypoid gear oil as specified
below (roughly up to level hole).
6) Install new gasket to level/filler plug and tighten level/filler
plug to specified torque.
Tightening torque
Rear differential oil level/filler plug
(b) : 50 N·m (5.0 kg-m, 36.5 lb-ft)
NOTE:
• It is highly recommended to use SAE 80W-90 viscosity.
• Whenever vehicle is hoisted for any other service work
than oil change, also be sure to check for oil leakage.
Differential oil
Hypoid gear oil API GL-5
For oil viscosity, refer to the chart.
Differential oil capacity
1.0 liters (2.1/1.8 US/Imp. pt)