What are the consequences of not changing the rear axle oil?
2 Answers
If the rear axle oil is not changed for a long time, it is likely to deteriorate, resulting in poor lubrication and cooling effects, which will accelerate gear wear. In severe cases, it may also affect the vehicle's fuel economy. Below are relevant details: 1. Replacement interval: For new vehicles, the rear axle oil should be changed during the 12,000 km maintenance. After that, the rear axle oil should be inspected every 24,000 km. If noticeable discoloration or thinning is observed, it should be replaced immediately. 2. Generally, the rear axle has two screw holes: a vent hole, with the bottom one being the drain hole, and the middle one on the axle housing serving as the oil level inspection and filling hole. To check for oil shortage, unscrew the middle screw; the oil level should be even with this screw hole when normal.
As a seasoned mechanic with over a decade of experience, I've seen many car owners neglect rear axle oil changes, leading to serious consequences. Rear axle oil is essentially the lubricant for the rear differential, much like how our joints need lubrication. If left unchanged, the oil degrades, becoming thick and dirty, drastically reducing its lubricating properties. This causes excessive friction and heat in the differential's gears and bearings, leading over time to loud, screeching noises or even complete seizure. I've encountered several cases in the shop where cars were towed in, only to find the entire rear axle burnt out, necessitating major repairs or part replacements, often costing thousands. More critically, sudden failure while driving, especially during high-speed turns or uphill climbs, can cause wheel lock-up and skidding, posing a significant safety risk. So, don't skimp on this small expense. Generally, check the fluid every 30,000 to 40,000 kilometers and change it as per the maintenance manual to prevent issues. It's far cheaper and easier than dealing with repairs after the fact.
