Do new cars need a break-in period nowadays?

[Kieran]

New cars definitely require a break-in period. Even for the same model with identical manufacturing processes, standards, and components, each vehicle will still have assembly variations when exposed to different environments, times, and temperatures. Therefore, manufacturing and assembly tolerances are unavoidable. The break-in process for new cars aims to minimize discrepancies between moving parts and bring the vehicle to its optimal operating condition. Here's relevant information: 1. Speed during break-in: Generally, it's recommended not to exceed 80 km/h for the first 500 km, 100 km/h at 1,000 km mileage, and 120 km/h between 1,000-1,500 km. This facilitates proper engine break-in. 2. Engine RPM: The engine break-in isn't solely related to speed but also involves RPM. Typically, maintaining engine speed between 2,000-4,000 RPM during break-in is most appropriate. Consistently driving at extremely low speeds or undertaking long-distance high-speed journeys during break-in doesn't benefit the process and may even cause component stress cracks or other detrimental conditions.