Many users encounter oil remaining when they are doing maintenance. They can only take home and use it at the next maintenance. How long can the oil be kept after opening? In addition, how to preserve the engine oil after opening to ensure that it will not deteriorate during the next maintenance?

Causes of Oil Pollution and Deterioration The shelf life of engine oil (fully synthetic, semi-synthetic, and mineral oil) is generally 4-5 years. Oil contamination and deterioration are mainly caused by the contact of oil, air, oxygen, and impurities in the air. The oil must be kept sealed.

Moisture content in the oil under normal conditions is below 0.03%. When the moisture content exceeds 0.1%, the additives in the oil (antioxidants, detergents, etc.) will fail, accelerating the oxidation process of the oil. The organic acids generated by the oxidation of engine oil and the acidic oxides in the exhaust gas from the engine react with water to form inorganic acids. These acidic substances increase the corrosion of the engine.

Therefore, when the engine oil contains more water, the lubricity of the engine oil will deteriorate, and the viscosity will decrease. If the engine oil is light, the engine oil will deteriorate prematurely and the engine parts will rust. If the engine oil is heavy, it will cause serious mechanical accidents such as shaft suspension and burning of the engine.

Oxygen engine oil is composed of base oil and additives. Although the base oil is generally stable, the additives of the important oil in the engine oil are much less stable. The oxygen in the air is prone to chemical reactions, especially in the sunlight. In the environment, the additive deteriorates, which greatly reduces the oxidation resistance and cleanliness of the engine oil.

Impurities and impurities mainly affect the cleanliness of the oil. Impregnation of oil in the engine oil will affect the lubrication of the oil, and even cause abnormal engine wear, and thus affect its sealing performance.

After the engine oil is stored after opening, the oil contamination and deterioration are known. The following method is used to solve the problem and analyze the preservation method of the engine oil after opening.

1. Immediately after opening the seal, seal the oil bottle cap immediately after the maintenance in the 4S shop or maintenance workshop is completed. It should be noted that since the original tin foil film has been destroyed, the rest of the cover pad has limited insulating effect. At this time, a layer of clean plastic film can be used to cover the bottle mouth. To prevent damage, it is best to fold it several times and then put it on. Screw on the bottle cap again, so that the sealing effect is better. Conditional can also be drip-sealed at the lid of the bottle.

2. After the oil bottle is sealed, it needs to be stored in a cool and dry place, and ensure that sunlight is not irradiated and oxidation of the oil inside is avoided.

3. After taking out the long-stored engine oil in the next maintenance, do not pour it completely in the process of adding to the engine. Keep some of it. Generally speaking, there will be trace amounts of moisture in the bottom of the oil bottle for a long time. The engine will affect its performance and even have a bad influence.

In general, the sealed storage period of used oil varies according to its type: the problem of mineral oil storage for 6 months is not significant; semi-synthetic can be stored for 9 months; full synthesis can be stored for 12 months or even longer. No matter which type of oil, this time is enough to support the next maintenance of the car.

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