How to evaluate the quality of lubricants

The three major tests for assessing the quality of lubricating oil are more critical. As a comprehensive assessment of the quality of lubricating oil, all countries in the world have basically reached the same trend, and established a four-part quality standard for lubricating oil physical and chemical indicators, simulation tests, bench tests, and driving tests. system.

Physicochemical indexes are the basis. Physical and chemical indicators for measuring the basic properties of lubricants include: kinematic viscosity, low temperature dynamic viscosity, viscosity index, flash point, pour point, sediment, moisture, foam, residual carbon, neutralization value, sulfated ash content And various element content and so on. These physical and chemical indicators are just the most basic indicators for measuring lube oil. If the physical and chemical indicators are not qualified, the following simulation tests and bench tests will not be discussed.

Simulation test is the preferred method of assessment. The first is the simulation test. During the research and development process of oil products, the technicians found that the physical and chemical indicators of the oil product could not explain the problem and could not reflect the ease of use of the mechanical friction pair. The test consists of the following components: a coke board test method and a heat pipe test method that reflect the clean dispersion and anti-oxidation of vehicle lubricating oil; a multimetal oxidation test method and a film oxidation test method that reflect the oxidizing ability of automotive lubricating oil under high temperature; A speckle test method that reflects the ability of automotive lubricating oil to disperse sludge; a high-temperature four-ball wear test method that reflects the wear resistance of vehicle lubricating oil. These simulation tests can only reflect the working conditions of the engine, and cannot simulate the effects of the engine under complex conditions and working conditions, especially the combustion products on the performance of the oil.

In addition, simulation test methods generally use more intensified or inductive test conditions. However, the enhancement will be lost because in the whole process of the engine operation, various comprehensive factors combine to affect the oxygen resistance, cleanliness, dispersion, and wear resistance of the oil product. It is impossible to simulate the performance test in a single item. The method is actually measured and evaluated, so the simulation test methods and their evaluation criteria are basically not reflected in the engine oil specification standards. The rig test reflects the fact that the problem is more true in order to truly reflect the use of the oil product, and it can also be recognized by the engine manufacturing department, and a gantry test to evaluate the performance of the lubricating oil has also been developed. The bench test is to install a representative engine in the test chamber, carry out the evaluation test under a certain period of time under the approved or recognized control conditions, and according to the performance indicators set by everyone before the test of the engine manufacturers, After the completion of the test, it will be determined; observe whether the test oil meets the requirements; if the oil's various indicators are within the limit, it can be considered that the oil is initially approved and the oil of the type is qualified. certificate. In principle, the market can be supplied. After the above three tests, the quality of lubricating oil can be fully guaranteed to meet the engine oil demand of each engine manufacturer.

The bench test is to install a representative engine in the test chamber, carry out the evaluation test under a certain period of time under the approved or recognized control conditions, and according to the performance indicators set by everyone before the test of the engine manufacturers, After the completion of the test, it will be determined; observe whether the test oil meets the requirements; if the oil's various indicators are within the limit, it can be considered that the oil is initially approved and the oil of the type is qualified. certificate. In principle, the market can be supplied. After the above three tests, the quality of lubricating oil can be fully guaranteed to meet the engine oil demand of each engine manufacturer.

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