What is the best speed for a new car on the highway?

[Vivian]

For the first 500 kilometers, the new car must not be driven with heavy loads, and the speed should not exceed 80 km/h. Within 1000 kilometers, it can carry slightly heavier loads, but the driving speed should not exceed 100 km/h. Within 2000 kilometers, the driving speed should not exceed 120 km/h. More detailed explanations are as follows: 1. Running-in period: Before the car is assembled, each moving part is processed separately, and there are geometric deviations in the processing of parts. Therefore, after assembly, some moving parts may have direct local contact, making it difficult for lubricating oil to enter the friction surface, resulting in early wear. The running-in period is the time during which these directly contacting parts are worn down, and this period is called the running-in period. The running-in mileage for a new car is generally 1000 to 3000 kilometers. 2. Generally, it is best to wait until after the first maintenance because the oil used before the first maintenance is the first batch, which contains a large amount of debris. Using this oil for high-speed driving will greatly increase engine wear and may even cause abnormal wear. As a result, the vehicle after the running-in period may not be in the best condition.