How Long Should a New Car Be Driven at High Speed?

[DiAustin]

It generally requires driving about 10 kilometers. During high-speed driving, pay attention to gear shifting, speed control, and clutch usage. The correct method for high-speed driving is as follows: 1. Driving at low and high RPMs: When driving at low RPMs, keep the engine above 3000 RPM before shifting gears. Maintain each gear for a period to ensure the pistons and gears operate under various conditions, achieving the purpose of high-speed driving. 2. Switch to manual mode: For automatic transmission cars, switch to "manual mode" or use low gears for adjustment. 3. Maintain engine RPM: Keep the engine RPM between 3000-5000. 4. Avoid "high-speed driving" before the first maintenance: Refrain from "high-speed driving" before the first maintenance, as it can cause severe engine wear. High-speed driving for a new car is primarily to reduce engine carbon deposits, not for breaking in major components.

[VanDeclan]

I just got my new car last year and did thorough research on the break-in period. Actually, the so-called 'running-in at high speed' doesn't necessarily mean racing - the key is to let the engine operate fully across different RPM ranges. For the first 1,500 kilometers, it's best to divide it into three stages: keep RPM below 3,000 for the initial 500 km; occasionally rev up to 4,000 RPM during the next 500 km but don't exceed 5 minutes; then gradually increase to around 4,500 RPM in the final 500 km. Each session lasting 10-15 minutes is sufficient, with the focus being to use all gear positions. Last time on the highway, I specifically used sport mode while maintaining safe following distance, and took the opportunity to verify the tire pressure monitoring system - that's the real key. Even the tire shop owner now compliments me on my professional break-in approach.

[McNora]

Veteran drivers tell you there's no need to deliberately run-in your car at high speeds! This is my third car, and nowadays new cars undergo cold running-in at the factory. If you really want to do it, just find a highway after the first maintenance and drive at a constant speed for half an hour—that's more than enough. The key is to vary the RPM: first drive at 60 km/h for a few minutes, then increase to 80 km/h for a while, and finally push to 100 km/h without speeding. Remember to switch to manual mode and cycle through gears 1 to 5 to let the transmission adapt. Last time, my nephew's new car was revving hard at a highway rest stop, and he got lectured by the traffic police—what we want is for the engine to work thoroughly, not to have a road rage episode.

[VonCarlos]

As someone who frequents 4S shops, technicians say the core purpose of breaking in a new car at high speeds is to expel metal shavings. The ideal period is within the first 300 km before the initial maintenance, with each session lasting about 20 minutes. Never floor the accelerator! Follow this step-by-step guide: 10 seconds at 4,000 rpm in 1st gear, 15 seconds at 4,500 rpm in 2nd gear, then increase by 500 rpm for each subsequent gear. However, ensure the coolant temperature reaches the midline before starting. Modern cars have higher precision—like my Japanese car, which I directly drove in S mode on mountain roads during the break-in period, and now it consumes 0.3 liters less fuel than friends who deliberately revved the engine. The key is to let the ECU learn driving habits, not to torture the engine.

[KaydenMarie]

Here's the truth from someone who's read the manufacturer's technical manual: German cars nowadays don't require traditional high-speed running-in at all. If you really want to do it, just remember three numbers: at 500 km, you're allowed to drive at 80 km/h for 15 minutes; at 1,000 km, you can increase to 100 km/h for 20 minutes; and after 1,500 km, you can drive as you please. But be careful not to maintain a constant RPM during the break-in period! On the highway, I deliberately use cruise control to repeatedly accelerate and decelerate, allowing the piston rings to fully break in. I've seen newbies revving the engine at the entrance ramp of the highway—that's what really damages the car. It's more scientific to let the RPM fluctuate between 2,500 and 4,000 while driving.

[VonMatteo]

A friend in auto repair said the biggest fear of high-speed running is overheating and cylinder sticking. The correct timing is during the latter half of the break-in period (around 800 km). Choose a quiet morning route, start accelerating when the coolant reaches 90°C. For sedans, maintain 3000-4000 RPM for 8 minutes; reduce to 5 minutes for SUVs. Once when accompanying a friend, he ran with AC on and fully loaded with four people—resulting in coolant temperature alarm! Key point repeated three times: No load! AC off! Run in segments! Personally, I slow down to cool for 2 minutes after every 5 minutes of running. Remember, most manuals nowadays have removed high-speed running requirements. If really concerned, just floor the accelerator a few times after the first service.