Differential Oil Inspection

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Place the vehicle on level ground.
Remove the filler plug and washer.

Fig 1: Identifying Filler Plug
Courtesy of MAZDA MOTORS CORP.
Verify that the oil is at the brim of the filler plug hole.
If it is low, add the specified oil.
Install a new washer and the filler plug, and tighten.

Tightening torque

40-53 N.m {4.1-5.4 kgf.m, 30-39 ft.lbf}