Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

Rear Axle/Differential



Rear axles and differentials use API GL-5 oils: SAE 90 above 0°F (-18°C) and SAE 80W below 0°F (-18°C). On models with limited slip differentials, use API GL-5 special SAE 90 lubricant.


See Figures 1 and 2

Periodic checking of the lubricant level is required at 6,000-7,500 mile (9,662-12,077 km) intervals. However, if you notice oil seepage from the rear axle, or a change in the sound of the axle, it is a good idea to check the oil level and replenish it if necessary. Any significant leaks should be repaired as soon as possible.

  1. Park the car on a level surface, set the parking brake and block the wheels.

Click image to see an enlarged view

Fig. Fig. 1: Common rear axle housing showing drain plug "A" and filler plug "B"

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Fig. Fig. 2: Checking rear differential fluid level-323 with 4WD, 929 and RX-7

  1. Remove the filler (upper) plug from the differential, using the proper size socket or ratchet and extension.
  3. Check the oil level; it should be up to the bottom of the filler hole. Add lubricant, as necessary.
  5. Clean the threads and reinstall the filler plug.