Do shock absorbers need to be replaced in pairs when leaking oil?
2 Answers
When replacing shock absorbers, it is necessary to replace two at a time. This is because replacing only one can lead to uneven balance and force distribution in the vehicle, causing the shock absorbers to bear different loads, which may result in safety issues. Here are some related details: 1. The function of shock absorbers: Automotive shock absorbers are connected between the wheel chassis and the vehicle body frame. They absorb vibrations when the vehicle encounters bumps and also provide stability during cornering. 2. The hazards of shock absorber oil leakage: Oil leakage in a car's shock absorber indicates damage. The damping effect will gradually decrease, and over time, once the oil inside the shock absorber is completely leaked, it will lose its damping function. Therefore, shock absorbers with oil leaks need to be replaced promptly. 3. Symptoms of shock absorber oil leakage: Any leakage or reduction of the internal oil in the shock absorber will affect its damping force. The main symptoms noticed in the driver's compartment include a softer vehicle suspension, and possibly looseness and unusual noises. On larger potholed roads, the shock absorber is also highly likely to be damaged due to bottoming out.
Having driven for decades, my experience tells me that it's really best to replace shock absorbers in pairs when one is leaking. Since the left and right shocks work in tandem, if one leaks and fails, the other might still barely hold up. But the inconsistency between old and new shocks can cause the car to tilt to one side, making it feel wobbly and unstable when driving. This increases the risk of losing control during steering and braking, which is extremely dangerous. It also accelerates tire wear and raises repair frequency, costing more in the long run. I've seen many older cars where replacing just one shock led to the other failing soon after. In fact, when checking for leaks, inspect the entire suspension system—including the shock tubes and linkages—and don't skimp on these small costs. Ensuring balance is the sustainable solution. Safety comes first, and regular maintenance can prevent such troubles.