Happy Run is a vehicle auxiliary product of BASF, and also provides OEMs of major automobile manufacturers, such as Volkswagen G 17. Its main component is polyisobutylene amine, which was originally patented by BASF. At present, it seems that some domestic manufacturers have succeeded in research and development and no longer rely on BASF imports.
Simply put, Happy Run is a gasoline cleaner, and the main components of the products provided by 4S stores and gas stations are the same.
As for the use, different people have different views.
For details of Corolla, please consult Aika Auto/162/