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Many users may ask this question: Can oil be used with the Dalutong rotary vane vacuum pump? **It is not possible. Then why is it necessary to use specified lubricating oil for rotary vane vacuum pumps? Next, an engineer from Daliutong will provide a detailed explanation. Some users of vane vacuum pumps use ordinary engine oil instead of the oil specifically designed for vacuum pumps in order to save costs. In fact, this not only increases the operating and maintenance costs of the vacuum pumps to some extent, but it also severely affects their service life. This chapter explains why it is necessary to use oil specifically designed for vacuum pumps in vane vacuum pumps. 1. The oil specifically designed for vacuum pumps has a certain viscosity, and the level of this viscosity determines the sealing performance of the vacuum pump; if the viscosity is too low, the sealing performance will be poor ； Excessively high viscosity increases the friction between the blades inside the pump and the cylinder body, which reduces the lubrication effect. At the same time, it makes it more difficult for the rotor to rotate, the pressure on the motor rises, and the oil temperature also increases. An increase in oil temperature accelerates the emulsification of the pump oil, directly affecting the level of vacuum. 2. The chemical properties of the oil specifically designed for vacuum pumps are more stable, with much lower levels of moisture, water-soluble acids, insoluble alkalis, and other impurities. Using this specialized oil helps to avoid the need to replace the vacuum pump oil frequently and ensures cleaner conditions inside the pump. 3. The saturated vapor pressure of the oil specifically designed for vacuum pumps should be low, with few volatile light fractions. If it is ordinary vacuum pump oil or engine oil, it evaporates easily; using oil that is not designed for vacuum pumps means having to refill it frequently. It can be seen from the above points that using proper oil specifically designed for vacuum pumps can effectively prevent factors such as emulsification and carbonization of the pump oil, which are detrimental to vacuum pumps. This approach addresses the difficulties associated with the maintenance of vacuum pumps at their root and extends their service life. Furthermore, when using a vacuum pump, it is necessary to regularly check the condition of the oil designed specifically for that pump. Issues such as emulsification of the oil, carbonization, the presence of impurities or unknown liquids, and a sudden increase in the amount of oil in the pump all require prompt replacement of the oil. When replacing it, it is important to use oil of the same type; this can be purchased from specialized manufacturers of vacuum pumps to ensure the proper functioning of the pump.