Why is the BMW e90 engine so loud?

[SawyerAnn]

BMW e90 engine noise may be caused by poor oil quality, loose engine mounts, abnormal oil condition, insufficient belt tension, etc. The specific details are as follows: Poor oil quality: When using low-quality fuel, the combustion condition inside the engine will deteriorate, causing the engine to vibrate violently and produce noise. Loose engine mounts: The engine is not simply placed in the engine compartment but is supported and fixed by components such as engine mounts. If these components age or become loose, it will cause the engine to produce noise during operation. Abnormal oil condition: Engine oil is an important component for engine lubrication. When there are issues with the oil, it can affect the engine's performance. For example, if the oil viscosity is too high, it can easily cause operational problems in the engine, reduce lubrication effectiveness, and lead to friction during engine operation, resulting in noise. Insufficient belt tension: When the engine belt tension is insufficient, the engine will produce abnormal noises during operation, severely affecting the driver's experience.