Is it necessary to replace the rear shock absorber if it's leaking oil on a Corolla?
2 Answers
The rear shock absorber of a Corolla must be replaced if it's leaking oil. Introduction to automotive shock absorbers: Shock absorbers rapidly dampen the vibrations between the vehicle frame and body, improving the smoothness and comfort of the ride. Most automotive suspension systems are equipped with shock absorbers, with the double-acting telescopic shock absorber being widely used. Shock absorbers are wear-prone components in vehicles. Their performance directly affects the driving stability and the lifespan of other parts, so it's essential to keep them in good working condition. Function of automotive shock absorbers: Shock absorbers ensure smooth vehicle operation by buffering vibrations. Without them, the car would drive unevenly and shake. Most automotive shock absorbers are hydraulic. Their working principle involves filling a cylinder, drilled with small holes and containing a piston, with pressurized oil. When the spring vibrates, the oil is forced through the small holes, thus providing damping.
Just helped a friend with this issue a couple of days ago. The oil leakage from the Corolla's shock absorbers really depends on the severity. If you wipe off the oil stains and then see a coin-sized oil stain reappear after three or four days, it can still last for another 3,000 to 5,000 kilometers. But if it's like my car last year, where oil was dripping onto the brake discs, making a thumping noise over speed bumps and causing the car to pull to one side, you must replace it immediately! If you don't, it will wear out the tires very quickly, and the rear end may skid during emergency braking, which is especially dangerous in heavy rain. The mechanic said the original part costs around 400 yuan per unit, and you'll need a wheel alignment after replacement. However, if it's just a slight oil film on the surface, you can clean it with carburetor cleaner and observe for half a month—if no new oil stains appear, then it's fine.
