Do modern cars still need a break-in period?

[McAnderson]

It is still advisable to perform a certain break-in period. The details are as follows: 1. Most new cars nowadays undergo a "cold break-in" before leaving the factory. This process involves mounting the engine on a specialized machine and using an electric motor to run it in. During this process, most burrs on the components can be worn away. Since the engine is not operating during the cold break-in, there is no high temperature generated by fuel combustion, hence the term "cold break-in." 2. Not all vehicles undergo a "cold break-in" before leaving the factory, as not all car manufacturers have the technical capabilities for this process. Additionally, performing a "cold break-in" on every engine does not mean that further break-in is unnecessary. You can check your vehicle's user manual for specific details. If you are unsure, it is still best to perform a certain break-in period.