Shelf life of lubricating oil
Viscosity, the ability to prevent oil flow and prevent yourself, is the most important attribute of lubricants. In other words, the greater the viscosity of the lubricating oil, the less fluid the fluid is. The lower the viscosity, the better the fluidity, just like honey and water. The following is a lubricating oil brand, popularizing the viscosity of lubricating oil for everyone:
The introduction introduces the training of the introduced oil dealers. It has been emphasized that the factors that affect the change in viscosity are temperature and pressure. High temperature reduces the viscosity, and high pressure increases the viscosity.
For the same viscosity, the performance must be the same?
The protection performance depends not only on the viscosity, but also on the quality of the lubricant. High-quality lubricating base oil with good quality and stable performance. The base oil viscosity index is high, the temperature change is relatively stable, and the viscosity. In addition, the level of formulation technology also affects the final performance of the lubricant.
Viscosity is also divided into grades?
At present, it is a general reference to the American Petroleum Institute (American Petroleum Institute) standards. S series (gasoline engine series) is divided into SA, SB, SC, SD, SE, SF, SG, Shanghai, Si, SJ, SM, SN, and other levels. C series (series diesel engines) are divided into CG, CF, CH, CI and other levels. For example: Marked as 15W/40 SAE oil, the oil after the number W is at 100 degrees Celsius, the higher the viscosity value, the higher the viscosity. The 40th generation kinematic viscosity is 100 degrees Celsius.
The higher the viscosity, the better?
When in use, the lubricating oil can be squeezed between machines, and the low-viscosity lubricating oil is easily squeezed out. But the viscosity is not as large as possible! Imagine: too much viscosity of lubricating oil will increase the resistance of mechanical movement, not only can consume energy, but also cause frictional heat of lubricating oil. Therefore, the proper lubricating oil viscosity should be balanced by load, speed, size, etc.
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