What Causes Engine Shaking After Switching to High-Viscosity Oil?

[DeKayden]

Reasons for engine shaking after switching to high-viscosity oil are as follows: Oil Fill Level: If there is excessive oil, the surplus can easily enter the combustion chamber and form gummy carbon deposits. Over time, these deposits will worsen, leading not only to idle shaking but also clogging the catalytic converter's pores, resulting in excessive exhaust emissions and vibration. Oil Viscosity and Quality: Choosing oil that matches the vehicle model is crucial. Using oil with excessively high viscosity will impair its flow characteristics, likely causing engine shaking at idle. Additionally, oil quality must be carefully monitored, as substandard oils lack reliable quality assurance. This can lead not only to idle shaking but also directly affect the vehicle's overall performance.