A dispersant for lubricants is a crucial functional additive in engine oils and industrial lubricants, primarily tasked with effectively controlling sludge and deposits formed by oxidation and combustion. Under severe operating conditions of high temperature and pressure, lubricants oxidize to generate polar substances like resins and asphaltenes, while simultaneously accumulating insoluble contaminants such as soot and carbon deposits. The dispersant encapsulates these pollutants through its unique polar groups and disperses them throughout the oil, preventing their aggregation and deposition via powerful steric hindrance effects. This outstanding performance effectively maintains engine cleanliness, prevents oil passage blockage, filter failure, and wear of critical components, significantly extending lubricant service life and ensuring equipment operational stability. Modern ashless dispersants further avoid the ash-related issues associated with traditional metal salts, working synergistically with detergents and antioxidants to establish a comprehensive cleaning protection system for high-performance lubricants.