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Why is the Volkswagen Passat so noisy?

2 Answers

DelSteven

09/06/25 3:28am

Excessive engine noise in the Passat may be caused by carbon deposits, shock absorber issues, or poor vehicle sound insulation. Specific explanations are as follows: 1. Carbon deposits. As old engine oil becomes thinner with use, carbon deposits accumulate more and more. Thin oil is prone to oil leakage, leading to increased carbon buildup and significant power loss. When new oil is replaced, the engine may not adapt to the oil's viscosity immediately, potentially causing higher RPMs and resulting in louder engine noise. 2. Sound insulation. If the engine sounds normal from outside but feels noisy inside the car, it indicates poor vehicle sound insulation. Check the vehicle's sealing strips for signs of aging or consider improving the sealing effect to reduce noise. 3. Coolant. When the coolant temperature is too low, problems may arise, and engine noise can increase. It's advisable to check and replace the coolant to avoid further issues. 4. Shock absorbers. If the vehicle's shock absorbers are malfunctioning, it can lead to increased engine noise.

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OAlaina

09/18/25 3:28am

When I was driving my Volkswagen Passat, I noticed that the noise had increased, possibly due to some mechanical issues. Engine aging or excessive carbon buildup can cause unusual noises, especially more noticeable during acceleration. If the exhaust system has leaks or damage, it can produce a rumbling sound. Don't forget to check the tire wear condition; worn-out treads can easily generate tire noise, particularly a humming sound on highways. Damaged suspension components, such as shock absorbers or wheel hub bearings, can also amplify noise. It's advisable to perform regular maintenance and replace lubricants, while also checking for loose chassis bolts. Aged sealing strips can cause wind leakage, resulting in a whooshing sound inside the cabin. I've experienced a loose belt before, which produced an annoying squeaking noise. It's best to visit a repair shop for a comprehensive inspection as soon as possible to prevent the problem from worsening.

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