What is the basis of excessive moisture in lubricating oil?

Under normal conditions, the allowable moisture content in lubricating oil is less than 0.03% When the water content is more than 0.1%, the additives (antioxidants, detergents, dispersants, etc.) in the lubricating oil will fail and accelerate the oxidation process of the oil The organic acid produced by the oxidation of engine oil and the acid oxide in the exhaust gas of engine react with water to generate inorganic acid These acids increase the corrosion of the engine Therefore, when there is more water in the engine oil, the lubricity of the engine oil will become worse and the viscosity will decrease If the oil is light, it will lead to premature deterioration of the engine oil and rusting of the parts If the oil is heavy, it will lead to serious mechanical accidents such as shaft holding and tile burning of the engine We should try our best not to use the oil with excessive water, and find the water in the oil as early as possible, so as to avoid the damage to the engine caused by the excessive water in the oil In actual use, we can judge whether the oil contains excessive water by some simple methods 1 Color observation method: the oil that reaches the cleaning standard is translucent With water in the oil, the transparency will decrease When the engine is running for a period of time, the oil is milky white with foam 2 Combustion method: put the copper mesh into the inspected engine oil after it is cooked If there is a "crackling" sound, it means that the engine oil contains more water The inspected oil can also be injected into the test tube for heating When the temperature is close to 80-100 ℃, there will be a "crackle" sound in the test tube, which also proves that the oil contains more water 3 Drain method: after the engine is stopped, let the engine stand for about 30 minutes, loosen the drain plug, if there is water, it means that there is more water in the engine oil.