A, the American Association of Automotive Engineers for lubricating oil viscosity rating of the SAE, there are 0W, 5W, 10W, 15W, 20W, 25W, for multi-stage oil in the cold area, the smaller the number, the better the low temperature performance. SAE20, 30, 40, 50, for viscosity grade, it means 100 ℃ viscosity, the larger the number, the greater the viscosity. such as 15w40 that this oil in the low temperature in accordance with the requirements of 15W and 100 ℃ viscosity in line with SAE40 requirements.
B, the American Petroleum Association of oil Quality Grade assessment standard abbreviation for API. The level of petrol engine oil starts with s, and the letters are more advanced: the SA/SB/SC/SD/SE/SF/SG/SH/SJ diesel oil is CA/CB/CC/CD/CE/CF/CG to C. For example, SAE15W40APISG/CD said the winter and summer general North and south applicable multi-stage oil, with gasoline, diesel two performance general oil.
Generally, according to the use of lubricant and the situation can be divided into dispersed lubrication system and centralized lubrication system two categories, at the same time, these two types of lubrication system can be divided into total loss and cycle lubrication two categories.