When should the rear differential fluid be changed?

On vehicles with a Maintenance Minder, the rear differential fluid service usually appears as its own maintenance item when the system calls for it, and the timing depends on how the vehicle is driven. Towing, frequent hilly or off-road driving, and heavy loads can bring it up sooner.

A fixed 30,000-mile interval is not wrong, but it may be earlier than your vehicle needs. At 52,000 miles it is reasonable to check your service records and have a shop look at the fluid condition. If it is dark or there is any noise in tight turns, changing it is cheap insurance.

Whatever you decide, use the exact fluid type listed in the owner's manual for the all-wheel-drive system. Generic fluids are a common cause of noise and premature wear.