What happens if a new car directly runs on the highway for 13 hours?

[IsaacDella]

If a new car directly runs on the highway for 13 hours, the engine will operate at high speeds with significant mechanical wear. The first batch of engine oil typically contains more metal shavings and impurities. Using this oil with a large amount of debris for high-speed driving will greatly increase engine wear and may even cause abnormal damage. New cars require a break-in period, and prolonged high-speed driving is not recommended. However, modern car manufacturing processes are highly refined, and new cars undergo "cold break-in" before leaving the factory, where the engine is run on a specialized test stand. It is advised not to keep the new car in a single gear for extended periods on the highway. Instead, change the speed and gear every few minutes to allow all gears to break in evenly and prevent excessive wear on any single gear.