Why is the sedan noisy?

[StMary]

There are several reasons for excessive noise in sedans: 1. Excessive oil viscosity: Many people try different types of engine oil when changing it to find the most suitable one for their vehicle. However, if the oil is too viscous, it may result in insufficient oil flow into the hydraulic lifters, causing valve noise. This issue can be resolved by switching to a lower viscosity oil. 2. Carbon deposits in the cylinders: Using old oil can lead to thinning of the oil and increased carbon buildup. Thin oil may leak, causing more carbon deposits and power loss. When new oil is added, the engine may temporarily struggle to adapt to the new oil's viscosity, potentially increasing RPM and resulting in louder engine noise. Cleaning the engine's carbon deposits can help address this issue.

[DiTucker]

My previous car was also quite noisy, and I've summarized that the main issues fall into several categories. The engine becomes particularly loud as it ages, and using cheap engine oil can also cause this. When tires wear down to the warning line or the tire pressure is too high, you'll hear a buzzing noise at highway speeds. If the undercarriage has been damaged by potholes, the protective plate becomes loose, or the exhaust pipe hanger breaks, the sound of metal clashing can be very harsh. Aging door seals that let in wind can produce a whistling sound at speeds over 80 km/h. Another easily overlooked issue is the aging of engine mounts, which can cause the entire steering wheel to vibrate. The easiest solution is to take it to a repair shop for a full soundproofing treatment, but for daily maintenance, remember to use good engine oil and check the tires regularly.

[OPhoebe]

I've noticed car noise typically falls into three categories: tires, engine, and wind noise. When tire pressure exceeds 2.5 bar, driving on asphalt feels like drumming, and uneven tire wear creates unbearable noise. Engine noise heavily depends on maintenance – unfiltered air intake creates obvious whistling sounds if the air filter hasn't been changed in six months. Loose belt tensioners in older cars produce squeaks, while failing water pump bearings generate metallic grinding. For wind noise, I prefer listening with windows down – cracked door seals create noticeable drafts through side windows. An improperly closed trunk causes swirling airflow sounds in the cabin. I'd recommend trying quieter tires first, then inspecting chassis bushings.

[EzraMarie]

Excessive vehicle noise is usually most related to these components: Worn-out transmission system bearings produce a rhythmic humming; Worn brake discs and pads emit a screeching sound that makes your scalp tingle; A perforated exhaust system creates a chugging noise like a tractor. Unusual noises from the air conditioning compressor are common in summer, especially when refrigerant is low. Cracked suspension bushings produce a clunking sound over speed bumps. Severe engine carbon buildup can also cause metallic knocking sounds. The simplest self-check is to observe noise changes during cold starts—if it persists after warming up, mechanical components need inspection. Revving the engine in neutral while parked—if the noise persists, it's likely an engine issue.