Most manufacturers recommend that the differential fluid be changed every 30,000 to 60,000 miles. It is a messy job, and should be done by a licensed mechanic. ... Plus, because the differential is underneath the car, it will need to be lifted, so this is definitely not a DIY project.

Is it necessary to change rear differential fluid?

Because the differential is at the rear and under the car, it gets none of the star treatment that the engine up front does. But if lubrication in the car differential fails, you won't be getting very far for very long. Fortunately, you only need to change this oil every 30,000 to 50,000 miles.

When should you change differentials?

Most manufacturer maintenance schedules require the differential fluid to be changed every 30,000 to 60,000 miles, however, it can differ between vehicles. The job itself is actually pretty easy, however, if you're planning to change your vehicle's differential fluid at home, then it can get messy.