The research status of gasoline engine oil at home and abroad. To meet the needs of automobile emission performance control technologies for vehicle exhaust emissions, only the combination of internal and external purification can make the gasoline engine emission control within increasingly stringent regulations, while the external purification is the preferred three-way catalytic converter. The engine oil is required to readjust the formula to control the phosphorus content, reduce catalyst poisoning, and prolong the service life of the catalytic converter. In order to meet the needs of automotive fuel economy, in addition to improving the anti-friction properties of engine oils, it is also necessary to vigorously develop multi-grade oils with low viscosity levels in order to improve energy-saving effects. But the viscosity is low, the oil consumption increases, the engine oil is volatile and causes wear, which requires the base oil must be light, but also have small evaporation loss, high temperature and high shear viscosity can not be too small, oxidation stability is better, but also Meet the needs of longer and longer oil change periods. In order to adapt to the improvement of thermal efficiency, specific power and other power performance, the main measure is to use gasoline engine fuel direct injection technology, use of computer-controlled air-fuel ratio, so that complete combustion, improved emissions, and thus make the high efficiency of the pulse charging technology is also electronically controlled direct injection gasoline engine It can be applied to the engine to combine the power, emissions and economy of the gasoline engine. However, this also raises the temperature in the combustion chambers of gasoline engines and causes many problems such as high-temperature deposition, high-temperature anti-oxidation, high-temperature detergency, and high-temperature wear. The European gasoline sedans have higher requirements on the quality of lubricating oil than the American gasoline sedans, and they have formed the European standard for the minimum quality required for gasoline refueling. The gasoline engine oil specifications apply to various vehicles used in Europe. Each automobile manufacturing company can add some additional assessment items on this basis. A number of the company's assessment of the project, the formulation of the company's factory refueling and oil specifications, but the corporate standard must be higher than the European unified standards. Analog Performance Tests European countries have given greater attention to analog performance tests. The following test items have been set in the standard: high temperature and high shear viscosity. For the analog performance tests, only the oil grades from the -> grade began to attach importance, and European standards have always been more important. Square Corn Thresher,Maize Thresher Machine,Small Electric Corn Sheller,Automatic Corn Shucker Hunan Xinta Machinery Manufacturing Co., Ltd. , http://www.xyagriculture.com