Do New Automatic Cars Still Need a Break-in Period?

[StBriella]

If the vehicle's user manual does not specify otherwise, new automatic cars do require a break-in period. Break-in mileage details: The break-in mileage for a new car is typically 1,000-3,000 kilometers. The initial break-in period is 0-500 kilometers. During this phase, avoid aggressive acceleration or braking, and keep driving speed and engine RPM low—speed should not exceed 70 km/h, and engine RPM is best kept under 2,000. The mid break-in period is 500-1,000 kilometers, where driving speed and engine RPM can be moderately increased but should not exceed 90 km/h, with engine RPM capped at 2,500. The final break-in period is 1,000-3,000 kilometers, during which speed can reach up to 120 km/h on good road conditions. Warming up the car: Do not start driving immediately after starting the car. Wait until the coolant reaches normal operating temperature. Especially in cold winter, press the accelerator pedal gently to let the engine run smoothly. If you cannot warm up the car before driving, drive at low speed for the first 5 minutes after starting until the coolant temperature is sufficient before accelerating.

[DiWilliam]

Having driven for so many years, I remember manual transmissions used to require careful break-in for thousands of kilometers. Modern automatic transmission cars are much better now, with more precise engine components significantly shortening the break-in period. After reviewing many owner’s manuals and expert discussions, most modern automatic cars recommend gentle driving for the first few hundred kilometers—avoiding sudden acceleration, high-speed cruising, and heavy loads. This isn’t unnecessary worry; it mainly ensures perfect break-in for components like pistons and cylinder liners, extending engine life and improving fuel efficiency. I followed this advice—not pushing my new car hard in the first month—and saw noticeable fuel savings, with smoother performance long-term. In short, automatics make break-in easier, but some simple precautions are still worthwhile.