K858 is primarily used as a performance additive in lubricant formulations, especially in high-temperature and high-stress environments. It functions effectively as an anti-wear and extreme pressure (EP) agent, enhancing the durability and efficiency of industrial machinery and automotive engines. Its unique molecular structure allows for strong surface adhesion, forming a protective film that reduces friction and prevents metal-to-metal contact. It is commonly incorporated into gear oils, hydraulic fluids, and greases where thermal stability and oxidation resistance are critical. K858 also exhibits good compatibility with other additives, making it suitable for multifunctional lubricant blends. Due to its effectiveness at low treat rates, it is favored for use in environmentally aware formulations where lower additive concentrations are desired without compromising performance.