南平市建陽區(qū)、建甌市嘉實多5w-40合成機油批發(fā)商

The oil label includes two parts: classification and viscosity specification. The oil classification is represented by a two-letter combination. The beginning of the series represents gasoline engine oil, the general specifications from SA to SN (in alphabetical order, but without Si) , each increase of a letter, the performance of the oil will be better than the former There will be more additives in the oil to protect the engine; the lower the letters, the higher the quality level, and the international brand oil level is more than SF level. The series starting with something c something represents diesel engine oil. If the letters something s something and something c something are present simultaneously, the engine oil is of the gasoline-diesel type. The oil label is usually used to indicate viscosity and quality. The specific interpretation is as follows: The viscosity of lubricating oil use SAE grade mark, SAE is the abbreviation of American Society of automobile engineers. The smaller the previous numbers, the better the cold fluidity of the oil, the lower the ambient temperature available, and the better the protection of the engine during cold start The number behind w something is the index of high temperature resistance of engine oil. The larger the number, the better the protection performance of engine oil at high temperature. The label of the oil after classification indicates its viscosity specification, for example, in something 15W-40 and 5W-40 something, something w something indicates Winter (Winter) . The smaller the preceding number, the better the low-temperature fluidity of the oil, indicating the lower the ambient temperature available In cold start on the protection of the engine better, such as 5W stands for external low temperature-30 °C, and 20W low temperature-15 °C. The figures after w represent the kinematic viscosity of engine oil at 100 °C. The higher the value, the higher the viscosity. At 100 °C, the standard viscosity of 40 is between 12.5 MM2 / s and 16.3 MM2 / S, which is definitely not what some people say can be used at 40 °C.