Does the BMW rear axle oil need to be replaced?
2 Answers
BMW rear axle oil needs to be replaced. There is no fixed interval for replacing the rear axle oil, as it depends on the driving conditions and environment of the vehicle. Additionally, the replacement intervals vary among different oil brands, generally around 20,000-30,000 kilometers. Functions of rear axle oil: Lubricates the transmission system, reduces wear on gears and other moving parts, ensures normal operation of the transmission system, and extends its service life; minimizes friction and transmission losses outside of gear transmission, improving mechanical efficiency. Signs for replacement: If noticeable discoloration or thinning of the rear axle oil is observed during routine maintenance, it should be replaced immediately.
I've always driven a BMW X5, and the rear axle oil definitely needs regular replacement. Under normal driving conditions, the oil deteriorates over time due to oxidation and moisture absorption, leading to reduced lubrication performance. It should be checked and replaced every 50,000 to 80,000 kilometers—the BMW manual has specific recommendations, so don’t delay. I’ve changed it myself a few times: find a flat surface to lift the car, use a wrench to loosen the drain plug, drain the old oil, and refill with new oil. I recommend using the manufacturer’s specialized oil to ensure compatibility with the system. If you neglect the oil change, the differential’s internal gears experience increased friction, producing squeaking noises, and in severe cases, they may seize up, costing tens of thousands to repair. Make it a habit to check the oil condition during every maintenance session—it saves money and gives peace of mind. Small maintenance details protect your car’s longevity and ensure smoother, safer driving.
