The working principle of gasoline engine and diesel engine oil is different, to put forward different requirements, reflected in the preparation process of the oil, then the formation of the respective formula system. Although adding additives have detergent, dispersant and antioxidant, but due to solve the problem of different emphases, adding proportion is different, the gasoline engine low-temperature sludge is more outstanding, so adding dispersant than the proportion of diesel engine, while the high temperature detergency of diesel engine and the prominent problem of anti oxygen therefore, the detergent than the proportion of gasoline engine oil, especially a large load of CD grade diesel oil additive compound formula plus some sulfurized alkylphenols (such as LZ6499, LZ6500) to solve the high temperature oxidation resistance of anti corrosion problems. Related reading: how to distinguish the car is in the "burn oil" phenomenon of residual oil how to dispose of oil change more saving environmental protection.



Single stage and multistage oil oil selection



Single stage oil such as 5W, 30, 40, only comply with the SAE engine oil viscosity classification (SAEJ300Apr.84) in a single level, there are strict requirements of applicable environment temperature, such as the lowest temperature of SAE40 suitable for 0 DEG C; multistage oil can simultaneously satisfy multiple viscosity class, such as SAE15W/40, refers to the low temperature performance can meet the requirement of 15W, the high temperature viscosity can reach 40 of the index, which spans 5 viscosity grade, so the multistage oil can be used in four seasons.



Because the multistage oil has good low temperature flow and pump delivery performance, but also has high temperature lubricating ability, thus selecting multistage oil is the best choice, such as the northern region selection SAE5W/30, the Central Plains region selection SAE15W/40, southern area selection of 20W/50; but the multistage oil price to be more expensive than single grade oil, consider from economy, in some seasons can also choose single grade oil, such as the use of SAE30 in the northern area of the spring and autumn season, the use of SAE40 in summer; in the central region in winter using SAE40; use SAE30 in southern winter, spring and autumn using SAE40, use the SAE50 summer (see chart single and multistage oil viscosity level and suitable temperature of 1). For vehicle regions throughout the north and south of the multistage oil must be used, such as SAE15W/40.



The viscosity of the engine oil level selection



From the development of automobile manufacturing technology point of view, and the engine manufacturing more sophisticated, its output to the high power and high load development; from cars using environmental change point of view, with the development of highway, the car running on the high temperature and high speed in the environment with long time constant, all of the oil made more stringent requirements. From the economic maintenance, lubrication performance of high profile oil is good, not easy wear parts, repair cost was decreased, and the high profile of oil oil cycle can reach 8000~10000km, synthetic oil is as high as 15000~25000km; many aspects of integrated, selection of high-grade oil or cost-effective. Therefore, suggestions for selection of SF, SG grade gasoline engine, diesel engine using CD, class CE, or choose SF/CD, SG/CD general purpose engine oil. There are a lot of fake oil on the market at present, the best selection of the Great Wall, shell Shell and other domestic and foreign well-known brand of oil. In addition, in use, to be diligent to check, timely fill, form good habits change the oil regularly.