How long does it take for a new car's valves to stop making noise during the break-in period?

[MacXavier]

New car break-in period is generally between 1,000-1,500 kilometers. Although modern car engines undergo cold running-in treatment before leaving the factory, the more important role of the break-in period is to develop good driving habits. Definition of break-in period: The break-in period generally refers to the process where mechanical components make initial contact, friction, and engagement during operation. Precautions during break-in period: Avoid emergency braking when possible: Emergency braking not only shocks the braking system during break-in but also increases impact loads on the chassis and engine. It's best to avoid emergency braking within the first 300 kilometers of driving. Avoid overloading: Running a new car at full capacity during break-in can damage mechanical components. Therefore, within the first 1,000 kilometers of driving, the load should generally not exceed 75-80% of the rated capacity.