What are the causes of abnormal noises in the Mercedes-Benz C200?

[DelMiles]

The main causes of abnormal noises in the Mercedes-Benz C200 can be attributed to two major aspects: the engine and the transmission. Engine noise during startup: The primary reasons for engine noise during startup include the use of inappropriate engine oil, valve issues, and carbon buildup inside the engine. It is recommended to check the type of engine oil being used. Mercedes-Benz engines operate at high temperatures and pressures, requiring specific oil quality and viscosity. Typically, a 40-grade full synthetic oil is used. If a lower viscosity oil, such as a 30-grade, is used, it can lead to abnormal engine noises and increased sound levels. It is best to use a high-quality 40-grade oil. Transmission issues: Transmission problems are mainly caused by bearing damage, contaminated or poor-quality transmission fluid, loose or misaligned gear engagement, etc. For the transmission, it is essential to check whether the transmission fluid level is adequate, its quality meets standards, and whether it is contaminated or contains foreign particles. If such issues are found with the transmission fluid, it should be promptly topped up or replaced.