One means that lubricating oil can suspend insoluble substances such as jelly and carbon deposits generated after oxidation in the oil, forming a stable colloidal state and not easy to deposit on parts;

  The second is to wash off the jelly, carbon deposits, etc. that have been deposited on the engine parts through the washing action of lubricating oil. Detergent and dispersant is a surface-active substance that can absorb solid particle pollutants in the oil and suspend the pollutants on the surface of the oil to ensure that the oil participating in the lubrication cycle is clean and reduce high temperature and paint film Formation. Dispersants can disperse low-temperature sludge in the oil so that it can be filtered out in the lubricating oil circulation. Detergent and dispersing additives are their general term, and it also has the functions of washing, anti-oxidation and anti-corrosion. Therefore, it is also called multi-effect additive. In a certain sense, the quality of lubricating oil mainly differs in the performance of resisting high and low temperature deposits and paint film formation. It can also be said to be manifested in the performance and amount of detergent and dispersant in lubricating oil. It can be seen that detergent and dispersant Additives have an important impact on the quality of lubricating oil.