BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Drive Axle

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LEVEL CHECK



Front and Rear Axles
  1. With the car on a level surface, remove the filler plug from the side of the differential.
  2.  
  3. If the oil begins to trickle out of the hole, there is enough. Otherwise, carefully insert your finger (watch out for sharp threads) into the hole and check that the oil is up to the bottom edge of the filler hole.
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  5. If not, add oil through the hole until the level is at the edge of the hole. Most gear oils come in a plastic squeeze bottle with a nozzle; making additions is simple. You can also use a common kitchen baster. Use only standard GL-5 hypoid-type gear oil, SAE 90.
  6.  

DRAIN AND REFILL



  1. Park the car on a level surface and set the parking brake.
  2.  
  3. Remove the filler plug.
  4.  
  5. Place a large container underneath the rear axle. Remove the drain plug at the bottom of the differential and allow all lubricant to drain into the pan.
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  7. When all lubricant has drained out, clean and replace the drain plug. Use a new crush washer. Torque to 40 ft. lbs. (55 Nm) on the rear axle and 14 ft. lbs. (20 Nm) on the front axle.
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  9. Refill with GL-5 hypoid-type gear oil, SAE 90 until it runs out of the fill hole. Replace the filler plug and torque to 40 ft. lbs. (55 Nm). Run the car and check for leaks.
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