Engine oil knowledge

APIquality level API: American Petroleum Institute (American Petroleum Institute) The API quality grade classification of engine oil is determined by the American Petroleum Institute (API), the United StatescarThe Society of Engineers (SAE) and the American Society for Testing and Materials (ASTM) jointly formulated in 1971 and stipulated various test specifications.lubricating oilContinuous improvement and renewal of production level. According to the testing standards of the American Petroleum Institute, the assessment of the API quality level of oil products requires three assessment methods, namely, physical and chemical indicators, engine bench test and driving test. Divided into two series, namely gasoline engine oil series (S series), diesel engine oil series (C series) SAEViscosity grade SAE: Society of Automotive Engineers (Society of Automotive Engineer) SAE divides the engine oil into several grades according to the viscosity of the engine oil to facilitate users according to different Use engine oil with appropriate viscosity grade for ambient temperature conditions SAE viscosity grades from low to high are 0W, 5W, 10W, 15W, 20W, 25W, 20, 30, 40, 50, 60.Among them, W is the abbreviation of winter, which means oil for winter General Motor Oil for Gasoline and Diesel Engines API SL/CF – S spark ignition (gasoline engine) – C compression ignition (diesel engine) – L quality level (A – M) – F quality level (A – J-4) Engine oils marked as API SG/CD, API CF-4/SG indicate that gasoline engines and diesel engines are common, but the former is preferred for gasoline engines, and the latter is preferred for diesel engines. Single-stage viscosity and multiple-stage viscosity －Single-grade viscosity engine oil contains only a small amount or no viscosity index improver, which is suitable for the environment temperature with a narrow range, such as SAE30, SAE40 oil. － Multi-grade viscosity engine oil contains more viscosity index improvers and can work in a wide range of ambient temperatures. It is a general-purpose engine oil for winter and summer, such as SAE10W30, SAE15W40, etc. Steam engine oil series (S series) SE is used in the 1972 model to better prevent high-temperature oxidation and high-temperature deposits, and prevent Corrosion and anti-rust ability. SF is used in the 1980 model, and its performance is better than SE, and at the same time it has improved abrasion resistance. SG is used in 1989 models to inhibit engine deposits, oil oxidation, and reduce engine wear Damage and reduce the formation of low-temperature sludge. The minimum quality level requirements for electronic injection engines. SH is used in 1993 model, the test pass procedure is stricter than SG, low volatility, filterability Better. SJ is used in 1996 models, adding bench test and simulation test on the basis of SH, and Improve volatility. SL 2000 improved the weather resistance of automobile emission system, fuel economy type must use program VIB station Frame evaluation.Very low phosphorus content, effectively preventingThree-way catalytic converterBlockage. SM The latest gasoline engine oil standard of the American Petroleum Institute was promulgated in November 2004.

Automobile manufacturers generally recommend the viscosity and quality level of engine oil, and have the following tips: Please choose the appropriate viscosity according to the local climate.