When to Change Rear Differential Oil?

by Amy Rodriguez

Most drivers do not spend much time thinking about the complexity of a vehicle's turning capability. Keeping the wheels synchronized with each other is the duty of the rear differential. Keeping this assembly lubricated is essential for proper functioning.

Function of the Rear Differential

When a car turns a corner, the wheels on the inside of the curve spin more slowly than the wheels on the outside of the curve. This simple function is achieved by the rear differential and the gear ratios associated with it.


Rear differential fluid is actually the same fluid as the transmission, since they share common portions of the vehicle where the fluid is exchanged. Hence, when the transmission fluid is changed, or flushed, every 30,000 miles, it is also changing the rear differential fluid as well.

Expert Insight

Every vehicle is different, so referring to the specific owner's manual for the individual car is imperative when determining service intervals. Keeping up with car maintenance is key for a long vehicle lifespan.

About the Author

Writing professionally since 2010, Amy Rodriguez cultivates successful cacti, succulents, bulbs, carnivorous plants and orchids at home. With an electronics degree and more than 10 years of experience, she applies her love of gadgets to the gardening world as she continues her education through college classes and gardening activities.

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Photo Credits

  • photo_camera yellow car image by JoLin from Fotolia.com