Why is a new car slow to accelerate during the break-in period?

[DeAnnie]

Driving slowly during the break-in period is beneficial for the engine because the mechanical components of a new car need to wear in properly. Frequently revving the engine high and stepping hard on the accelerator during this period can cause damage to the engine. However, constantly driving at low speeds is also not advisable, as it can lead to carbon buildup in the fuel injectors, reducing the engine's effective power. Precautions for the break-in period of a new car include: 1. Warm up the car before starting: Wait 5 to 10 seconds after shifting into second gear before driving; 2. Avoid high-speed driving: There are speed limits for new cars during the break-in period, with domestic cars limited to 40 to 70 kilometers per hour and imported cars to 100 kilometers per hour; 3. Avoid overloading: Carrying too much weight during the break-in period can damage mechanical parts; 4. Do not remove the speed limiter prematurely: The speed limiter is a throttle device installed between the carburetor and the intake pipe. It should not be removed too early but rather after driving 1,000 kilometers; 5. Do not change the oil too early: The initial oil used in the car is specifically designed for the break-in period, featuring low viscosity, good heat dissipation, and excellent oxidation resistance; 6. Avoid emergency braking: Emergency braking not only shocks the braking system during the break-in period but also increases the impact load on the chassis and engine.