-HOW TO CARE FOR YOUR CAR’S DIFFERENTIAL–
Since you are protecting it with Alien Machine Worx’s Differential Cover, you should also make sure that it is cared for inside as well. Keeping maintenance is easier since it is only every 30 to 50 thousand miles, if it is ever running low on oil it can cause the inside to heat from friction, this will ultimately break down the differential and cause a damage that could have been easily avoided by providing the proper care.
Check out this Popular Mechanics Article