The classification method of China's engine lubricating oil is based on international standards and classified according to viscosity grade and service performance. The general principle of selecting engine lubricating oil is: First, select the quality level of the lubricating oil according to the load and the use conditions of the vehicle; then select the lubricating oil grade according to the temperature, and under the premise of ensuring lubrication, the grading should be as small as possible. lubricating oil.
1 Select the oil according to the quality level of the lubricant provided in the vehicle manual. The quality level of gasoline engine oil is mainly selected based on the compression ratio of the gasoline engine. If the gasoline engine compression ratio is less than 7.0, SC grade oil can be selected; the compression ratio is between 7.0 and -. . . . ;8. Between ° °, optional SD grade oil; compression ratio greater than 8.0, can be used SE or SE, kA on the level of gasoline engine oil.
2 According to the production year of imported vehicles, select the oil quality level.
3 Select the quality level of the lubricant according to the structure of the engine intake and exhaust system. If the crankcase forced ventilation device is installed, SD grade oil shall be used; with the exhaust gas circulation system, SE grade oil shall be used; with the exhaust gas conversion device, SF grade oil shall be used.
4 According to the engine operating characteristics and use of the environment to choose. For engines with small gaps, light loads, low operating temperatures, high rotational speeds, and low wear, lubricating oils with a small degree of slag should be used; on the contrary, lubricating oils with a relatively high degree of slag should be used. For the winter (low temperature), the lubricant with small viscosity should be used; on the contrary, the lubricant with larger viscosity should be used. If the engine is in a low-temperature and low-speed state for a long time, high-temperature and high-speed conditions, work in places with serious dust pollution, full load or overload, frequent changes in operating conditions, etc., the quality of selected lubricants should be improved by a grade.
1 Select the oil according to the quality level of the lubricant provided in the vehicle manual. The quality level of gasoline engine oil is mainly selected based on the compression ratio of the gasoline engine. If the gasoline engine compression ratio is less than 7.0, SC grade oil can be selected; the compression ratio is between 7.0 and -. . . . ;8. Between ° °, optional SD grade oil; compression ratio greater than 8.0, can be used SE or SE, kA on the level of gasoline engine oil.
2 According to the production year of imported vehicles, select the oil quality level.
3 Select the quality level of the lubricant according to the structure of the engine intake and exhaust system. If the crankcase forced ventilation device is installed, SD grade oil shall be used; with the exhaust gas circulation system, SE grade oil shall be used; with the exhaust gas conversion device, SF grade oil shall be used.
4 According to the engine operating characteristics and use of the environment to choose. For engines with small gaps, light loads, low operating temperatures, high rotational speeds, and low wear, lubricating oils with a small degree of slag should be used; on the contrary, lubricating oils with a relatively high degree of slag should be used. For the winter (low temperature), the lubricant with small viscosity should be used; on the contrary, the lubricant with larger viscosity should be used. If the engine is in a low-temperature and low-speed state for a long time, high-temperature and high-speed conditions, work in places with serious dust pollution, full load or overload, frequent changes in operating conditions, etc., the quality of selected lubricants should be improved by a grade.
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