Why does the engine make noise after an oil change?

[VonRosalie]

The reason the engine makes noise after an oil change is that the engine oil is overfilled. If the engine oil is overfilled and not addressed, it may lead to oil burning, especially at high RPMs, which increases the engine's workload and results in engine noise. During the complete combustion process of the engine, some high-viscosity oil may not fully oxidize and remains in the engine combustion chamber and on the spark plugs, forming carbon deposits. After adding new oil, the incompatibility in viscosity between the new and old oils can cause carbon deposits to accumulate further, increasing the engine's RPM and resulting in excessive noise.