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

Rear Axle/Differential

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FLUID RECOMMENDATIONS



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.

LEVEL CHECK



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.
  2.  



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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.
  2.  
  3. Check the oil level; it should be up to the bottom of the filler hole. Add lubricant, as necessary.
  4.  
  5. Clean the threads and reinstall the filler plug.
  6.  
  7. Unblock the wheels.
  8.  

DRAIN AND REFILL



See Figures 1 and 2

The oil should be changed at 7,500 miles (12,077 km), then at 30,000 mile (48,309 km) intervals. Proceed as described below:

  1. Park the car on a level surface. Set the parking brake and block the wheels.
  2.  
  3. Position a drain pan beneath the rear axle/differential and remove the drain (lower) plug, using the proper size socket or ratchet and extension. Allow the oil to empty into the container.
  4.  
  5. Clean and reinstall the drain plug.
  6.  
  7. Unscrew the filler (upper) plug, using the proper size socket or ratchet and extension, then add the appropriate grade of lubricant, depending upon ambient temperature.
  8.  
  9. Fill to capacity, until the level reaches the bottom of the filler hole. See the Capacities chart at the end of this section.
  10.  
  11. Clean and reinstall the filler plug.
  12.  
  13. Remove the drain pan and unblock the wheels.
  14.  

 
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