What are the test items for new hydraulic oil?

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What are the testing items for new hydraulic oil? Even when using proper quality oil, it is still necessary to prevent contamination by pollutants； The most important preventive measure is the quality analysis of oil products, and this should start with the inspection upon their arrival at the facility. Many useful pieces of information can be obtained from these quality checks; after all, the oil supplied to the plant is often not clean enough. Such testing and analysis are meaningful only before the oil enters the company’s main storage tanks or before it is used in large-scale equipment. Based on the test results of the oil cleanliness, the user decides whether filtration is necessary and how to carry out the filtration. In practice, detecting only the particle count is of little use. It is also necessary to know what size these particles are; in addition, it is important to control the water content in the oil, as too much water can cause corrosion and oxidation of mechanical components. The testing parameters for new hydraulic oil include: kinematic viscosity at 40°C and 100°C (with the flow-through method), viscosity index, water content, pour point, total acid value (by potentiometric titration), four-ball test, and spectral elemental analysis.