Why is the sedan noisy?
1 Answers
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.