With the continuous improvement of additive performance and the continuous maturity of additive compounding technology, lubricating oil mainly depends on chemical reaction film rather than oil viscosity; The adhesion of lubricating oil to the surface of the meshing surface depends not only on physical adsorption, but mainly on chemical adsorption. The strength of chemical adsorption is 5 ~ 10 times higher than that of physical adsorption; The application of lubricating oil additive compounding technology can form a reaction film at the parts that need lubricating oil and effectively protect the meshing surface.