subject: The Advantages of Having Your BMW Serviced Properly [print this page] The gear box on the back end of your car is filled with gear oil and many people never change it out for the entire life of the vehicle. This gear oil in the rear differential should be changed out about every 40,000 miles or so. Particularly if you live in a rainy damp climate. There's a drain plug on the bottom and a fill hole on the side.
The Advantages of Having Your BMW Serviced Properly
