How to ensure the quality of lubricating oil

  The three major tests for evaluating the quality of lubricants are more critical. As a standard for comprehensively evaluating lubricant quality, countries around the world have basically become consistent, establishing a quality standard consisting of four parts: physical and chemical indicators of lubricants, simulation tests, bench tests, and driving tests. system.

Physical and chemical indicators are the basis. The physical and chemical indicators used to measure the basic performance of lubricating oil include: kinematic viscosity, low temperature dynamic viscosity, viscosity index, flash point, pour point, sediment, moisture, foam, carbon residue, neutralization value, sulfated ash and content of various elements, etc. These physical and chemical indicators are only the most basic indicators for measuring lubricating oil. If the physical and chemical indicators are not qualified, the subsequent simulation test and bench test will be impossible.

The simulation test is the best evaluation method. The first is the simulation test. During the research and development process of the oil, the technicians found that the physical and chemical indicators of the oil can not explain the problem or reflect whether the mechanical friction pair is easy to use. The main test consists of the following parts: the test method of coke forming plate and the test method of heat pipe, which reflect the cleaning, dispersion and oxidation resistance of lubricating oil for vehicles; the test method of polymetallic oxidation and the test method of thin film oxidation, which reflect the oxidation resistance of lubricating oil for vehicles at high temperature. ; Spot test method reflecting the ability of automotive lubricating oil to disperse sludge; high temperature four-ball machine wear test method reflecting the anti-wear level of automobile lubricating oil. These simulation tests can only simply reflect the working condition of the engine, and cannot simulate the influence of the engine on the oil performance under complex conditions and working conditions, especially the combustion products. In addition, the simulation test method generally adopts more intensive or generalized test conditions. However, strengthening will be unreal, because in the entire operation of the engine, various comprehensive factors combine to affect the anti-oxidation, cleaning, dispersing and anti-wear capabilities of the oil, and it is impossible to perform a single performance evaluation simulation test. The method is as measured and evaluated, so the simulation test methods and their evaluation indicators are basically not reflected in the specifications and standards of engine oil. The bench test reflects the problem more real In order to truly reflect the use of the oil, it can also be recognized by the engine manufacturing department, and a bench test to evaluate the performance of the lubricating oil has been developed. The bench test is to install a representative engine in the laboratory, and conduct an evaluation test for a certain period of time under approved or certified control conditions, and wait for the bench according to the performance indicators agreed by the engine manufacturer before the test. Judgment after the completion of the rack test; observe whether the testable oil product meets the requirements; if all the judgment indicators of the oil product are within the limit range, it can be considered that the oil product is preliminarily approved, and the oil product of this type is qualified. certificate. In principle, it can be supplied to the market. After the above three tests, the quality of the lubricating oil can be fully guaranteed to meet the engine oil demand of various engine manufacturers.

The bench test is to install a representative engine in the laboratory, and conduct an evaluation test for a certain period of time under approved or certified control conditions, and wait for the bench according to the performance indicators agreed by the engine manufacturer before the test. Judgment after the completion of the rack test; observe whether the testable oil product meets the requirements; if all the judgment indicators of the oil product are within the limit range, it can be considered that the oil product is preliminarily approved, and the oil product of this type is qualified. certificate. In principle, it can be supplied to the market. After the above three tests, the quality of the lubricating oil can be fully guaranteed to meet the engine oil demand of various engine manufacturers.

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