What are the reasons for the loud engine noise in Mercedes-Benz GLC?

[MacCollin]

Mercedes-Benz GLC engine noise may be caused by the following reasons: 1. Incorrect engine oil condition: When the viscosity of the engine oil is too high, it can easily lead to operational issues in the engine, reducing lubrication effectiveness and causing friction during operation, which results in noise. 2. Insufficient belt tension: When the engine belt tension is insufficient, the engine will produce sharp noises during operation, significantly affecting the driver's experience. 3. Leakage in the intake or exhaust pipes: When there is a leakage in the intake or exhaust pipes, starting the engine will cause gas to escape from the leakage points during intake and exhaust, leading to vibrations and noise.

[DeMakayla]

My Mercedes-Benz GLC started making louder noises when driving two years ago, which was quite annoying. After checking, I realized it was time to change the engine oil. When the oil ages or runs low, friction between engine components increases, leading to louder noise. Additionally, aging or loose belts, such as those for the AC or alternator, often produce squeaking sounds. Small holes or leaks in the exhaust system can also cause hissing noises. For high-mileage cars, carbon buildup is common, affecting combustion stability in pistons and valves, which amplifies noise. I make sure to check the engine oil and belt condition every 5,000 kilometers to prevent minor issues from worsening and avoid costly wear. Delaying maintenance can damage the engine, making the noise even more disruptive and reducing driving comfort. Mercedes-Benz maintenance may be a bit pricey, but it’s definitely worth it.

[CooperRose]

As a car enthusiast, I believe that excessive engine noise can be attributed to poor oil quality or abnormal oil levels, where insufficient lubrication increases friction and noise. A loose belt system or a faulty tensioner pulley can cause squeaking sounds. Leaks in the exhaust manifold or muffler can result in high-frequency hissing noises. For a GLC with a turbocharger, damaged fan blades or clogged air intake can also produce abnormal sounds. Carbon buildup leads to uneven combustion, creating additional noise. Regular oil changes and throttle body cleaning are effective preventive measures. Check the air filter and replace it if clogged to prevent dust-induced noise. Identify the source of the noise—issues at the front may involve the belt system, while rear noises could indicate an exhaust leak. Addressing minor issues early saves money and ensures peace of mind.

[OSophia]

Safety is the top priority. A sudden increase in engine noise can be dangerous. It may be due to oil issues, where low oil levels cause increased friction and noise. Alternatively, an exhaust leak poses a high risk of carbon monoxide leakage. Loose or broken belts can also affect safety. Stop promptly to check the oil dipstick for level and color, and top up if needed or stop driving if oil is insufficient. Visit a professional shop for diagnosis to avoid breakdowns or serious failures on the road. Do not ignore increased noise; protect your vehicle's lifespan and your own safety.