Does a 4WD Vehicle Need Rear Axle Oil Replacement?
2 Answers
4WD rear axle oil requires regular replacement. Here is relevant information: Part-time 4WD: This refers to a system where the driver can manually choose between four-wheel drive (4WD) and two-wheel drive (2WD). The switching is typically done via a knob or lever. Full-time 4WD: Unlike part-time 4WD, full-time four-wheel drive (AWD) means all four wheels are constantly driven, whether traveling straight or turning. It generally allows adjustment of the torque distribution ratio between front and rear wheels based on driving conditions. On-demand 4WD: This refers to a drive system that automatically switches to two-wheel drive when 4WD is not needed and engages four-wheel drive when necessary.
I've been driving 4WD off-road vehicles for over a decade, and rear axle oil definitely needs regular changes. The gears in the differential are constantly grinding, and without fresh oil for lubrication, the car starts creaking and struggles to run smoothly. I remember once delaying the change until 60,000 km—the car was bouncing badly, and when I took it to the shop, the oil was black and sludgy. The mechanic said the gears would've worn out if I'd waited any longer. Now, I stick to the manual's recommendation of changing it every 40,000–50,000 km. Spending a little over a hundred bucks buys peace of mind. It also prevents rear axle leaks or strange noises—long delays can lead to much higher repair costs. Regular maintenance keeps the car running longer and smoother, especially when frequently tackling rough off-road terrain where oil degrades faster. Checking the dipstick is just part of my routine.
