Montero XLS 4WD V6-3.5L SOHC (2001)
Fluid - Differential: Testing and Inspection
FRONT AXLE AND REAR AXLE (CONVENTIONAL DIFFERENTIAL) (INSPECT OIL LEVEL)
Remove the filler plug and inspect the oil level at the bottom of the filler hole. If the oil level is slightly below the filler hole, the condition is satisfactory.