Does running a new car at high speed without break-in have any impact?

[MacJeremiah]

Running a new car at high speed without break-in has no impact, as long as you don't speed or violate traffic rules. Modern factories already conduct cold break-in for vehicles before leaving the factory, so owners don't need to perform additional engine break-in after purchase. Normal driving is sufficient, and highway driving won't cause issues - it may even help the engine break in better. In the past, due to backward manufacturing techniques, automotive components had larger tolerances and insufficient fitting precision, requiring a break-in period after assembly. However, with today's advanced automobile manufacturing processes and high-precision parts machining, new vehicles no longer need a so-called break-in period. Generally, after driving at low speed for several dozen kilometers to familiarize yourself with the car's condition, the vehicle can operate at full load - meaning you can directly drive on highways or mountainous roads. This approach also helps identify potential issues early for timely resolution.