Do all four engine mounts need to be replaced together?
4 Answers
When replacing engine mounts, it is not necessary to replace all four together. Function of engine mounts: Typically, the main body of an engine mount is made of rubber. Its purpose is to create a flexible connection between the engine and the vehicle body, reducing the vibrations absorbed by the rubber cushioning in the engine mount. Symptoms of faulty engine mounts: If the engine mounts are severely aged or cracked, you may feel a loose or shaky sensation between the engine and the vehicle body during acceleration or braking. Causes of engine mount wear: Engine mounts are wear-and-tear components because the rubber cushioning inside, which is filled with fluid, deteriorates over time. All types of synthetic rubber age, and during this process, the rubber gradually hardens, leading to diminishing vibration-dampening effects. Additionally, low temperatures can cause the rubber to become brittle, and large temperature fluctuations can make it more prone to cracking.
From my experience, it's indeed recommended to replace all four engine mounts at the same time. This is because these rubber cushions age unevenly, and replacing just one faulty mount will increase the load on the new one, potentially causing premature wear or increased engine vibration. In severe cases, it may affect driving balance or even damage other components. I've inspected many vehicles, and if the old mounts show cracks or deformation, replacing all ensures system coordination and smoother operation. Always opt for genuine parts—it's a one-time investment that saves you from repeated repairs and proves more economical in the long run. After replacement, a dynamic balance test is advisable to ensure everything runs smoothly. This advice is particularly crucial for older models or high-mileage vehicles to prevent minor issues from escalating into major faults. During regular car washes, pay extra attention to any unusual noises from the chassis for early detection and resolution.
Having driven hundreds of thousands of kilometers, I once tried replacing just one engine mount, only to have another fail shortly after, costing me double in repairs. Now I believe full replacement is the wise choice unless the others appear as sturdy as new. These rubber mounts collectively support the engine, and mixing old with new can cause uneven vibrations, making the car shake noticeably—passengers complained about discomfort. Replacing all four at once may cost more upfront, but it's a permanent solution with markedly improved driving experience. Regular inspections are crucial, especially for vehicles over 5 years old. If you hear creaking from the chassis or feel slight steering wheel tremors, visit a repair shop immediately. Opt for durable materials—avoid counterfeit parts to prevent greater losses.
From a cost-saving perspective, replacing just the faulty engine mount instead of all four can temporarily solve the problem. However, the risk is that the remaining old mounts may fail soon, leading to secondary repair costs. My approach depends on the vehicle's condition: for new cars under 10,000 km, partial replacement may suffice; for older vehicles over 100,000 km, it's more economical to replace all mounts since rubber degradation is usually even. Always have a professional technician assess the condition of other mounts—they use tools to accurately test hardness. Never compromise safety; when in doubt, consult multiple shops for quotes.
