Differential Oil Replacement

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Remove the filler and drain plugs.

Fig 1: Removing Filler And Drain Plugs
Courtesy of MAZDA MOTORS CORP.
Drain the differential oil into a container.
Wipe the plugs clean.
Install the drain plug and a new washer.
Tightening torque
1. 39.2-53.9 N.m {4.00-5.49 kgf.m, 29.0-39.7 ft.lbf}
Add the specified oil from the filler plug until the level reaches the brim of the plug hole.
Specified oil
1. Type:API service GL-5 SAE 90
2. Capacity (Approximate quantity)
  1. BP with TC:0.7-0.9 L {0.8-0.9 US qt, 0.62-0.79 imp qt}
  2. BP:1.0L {1.1 US qt, 0.9 Imp qt}
Install the filler plug.
Tightening torque
1. 39.2-53.9 N.m {4.00-5.49 kgf.m, 29.0-39.7 ft.lbf}