Should New Cars Be Driven at High Speeds?

[VonAubree]

New cars do not necessarily need to be driven at high speeds. Driving at high speeds is meant to help the car reach its optimal state earlier, but it is not necessary to deliberately run at very high speeds for break-in purposes. After a new car reaches 3,000 kilometers, it is recommended to drive on expressways or highways twice a month. For example, maintain a relatively high speed, such as 120 km/h, for about ten minutes, then slow down for a while before accelerating again. For manual transmission or semi-automatic cars, using high RPMs in lower gears can also achieve the break-in effect, although fuel consumption will be higher. For safety reasons, avoid driving excessively fast just for the sake of high-speed break-in. Normal driving can also help the car reach its optimal state—it’s just a matter of time.

[DeLily]

I believe that taking a new car on the highway is indeed beneficial for engine break-in. As a car owner, I've noticed that after leaving the factory, internal engine components like piston rings and metal surfaces still have minor imperfections that require time to smooth out. Appropriately driving on the highway, such as maintaining a steady speed of 80-100 km/h for half an hour, can help polish these imperfections, improving sealing and fuel efficiency. Although modern engine technology is advanced, it's still advisable to be gentle during the first 1,000-2,000 kilometers: avoid sudden acceleration or prolonged idling, and gradually increase the load. This approach isn't too aggressive—just drive as you would during a normal long-distance trip. Skipping the break-in process might lead to slightly higher fuel consumption or reduced engine lifespan. Don't believe the myth that you need to speed; a calm driving style can make the car run smoother in the long term, lowering maintenance costs. I recommend scheduling at least one highway trip during the break-in period.

[LeJourney]

I've driven several new cars and have a habit of taking them on the highway early to test their feel. New cars always seem a bit restrained at first, with the engine not fully loosened up. I usually hit the highway after 500 kilometers, maintaining a steady speed of 90-110 km/h for about 40 minutes without any aggressive maneuvers. After this, the acceleration becomes more responsive, the noise reduces, and the drive feels much smoother. But I don't insist on it—friends who didn't do this also had their cars running just fine. Each car is different; some engines are so finely tuned they don't need special treatment. The key is to check the manual: most manufacturers recommend avoiding extreme driving for the first 3,000 kilometers. My experience is that highway running is more of a psychological comfort, the real point is to let the engine adapt to the load, not to damage it. Overall, it's good to be cautious during the break-in period, whether you choose to run it on the highway or not—just don't stress yourself too much about it.

[Lillian]

I believe running-in a new car at high speeds should be done with caution, and it's best to refer to the owner's manual. Many manufacturers like Toyota and Ford state that modern engines don't require intentional high-speed break-in due to more precise manufacturing. Just drive gently for the first 1,500 kilometers: avoid speeding or sudden braking, and the engine will naturally adapt under normal usage. Deliberate high-speed driving may damage the transmission system or shorten its lifespan, especially if done improperly. I recommend driving steadily during the first month, as the break-in period includes components like brakes and tires. High-speed running isn't mandatory; the worry-free approach is to follow the manufacturer's guidance to avoid unnecessary hassle, ensuring both safety and fuel efficiency.

[SanPeter]

Modern new cars don't actually require forced high-speed running-in. With advanced engine manufacturing technology and well-preset piston ring sealing, normal driving for the first 2,000 kilometers is sufficient for break-in. From my research, forced high-speed driving actually increases burden and may lead to minor malfunctions. It's better to maintain steady daily driving at 80-120km/h for natural running-in. For turbocharged vehicles, pay attention to temperature control, but don't take risks. The disadvantages of not performing traditional break-in are often exaggerated; in reality, many vehicles remain durable without high-speed running-in. The key is maintaining proper maintenance - change engine oil frequently during the break-in period for smoother performance.