What Causes Increased Car Noise?

[OCassandra]

Here are the main reasons for increased car noise: 1. Engine mount rubber aging: After prolonged use, the rubber material mounts become brittle with age, failing to provide noise reduction. 2. Tire wear: Car tires are the most prone to wear; as tires and road surfaces gradually wear and age, their noise reduction and shock absorption effects diminish, resulting in noise. 3. Shock absorber component aging: The shock absorption effect decreases as parts age, causing passengers to feel more vibration and noise inside the car. 4. Low oil viscosity: High-viscosity oil maintains engine component lubrication, but prolonged use reduces oil viscosity, diminishing its lubrication and wear resistance, thus increasing engine noise. 5. Seal aging: The external sealing of the car is crucial for noise control. If engine noise is heard from the car's underside during inspection, check the seals.