Section 117 (Axle Shafts): Lubrication
WARNING: This page is about a different car, the 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
For the rear differential, use SAE 80W-90 rear axle lubricant. Rear axle fluid capacity is 3.0 pints (1.4 L). Fill the rear axle 1/8-3/16" (3-5 mm) from the bottom of filler hole.