Many owners asked how long the oil shelf life? In fact, the problem is very simple.
People eat, machines eat oil, but the common ground is: fresh is good.
After the general engine oil is unsealed, it should be kept in the dark place and the indoor temperature can not be too high.
In addition, it is best not to exceed three years, the general will not mark the expiration date, the oil in the case of undamaged packaging, indoor storage, at least 5 years to ensure that the synthetic oil longer, no deterioration can continue to use. ..! Well stored OK! ...!
Oil base oil from thousands of years underground, and then refined by the petrochemical plant, the main component of hydrocarbons, the physical properties are quite stable.
Of course, there are additives in lubricating oil components, which are dissolved in the base oil among them, the proportion of the products according to different quality levels of about 5-30%, unless it is a large temperature difference and a long time of static storage, It is possible to have a small amount of additive components precipitated, such as white precipitate, but as long as the shaking or at high temperatures (such as driving the engine interior) will dissolve, does not affect the performance and use.
That being said, but because the oil is not added to the engine on the line, but also to meet the various indicators of the engine, the engine can work better.
Engine oil requirements
As a mechanical engine, the requirements for lubricants compared with the general machinery has its common side, requires a suitable viscosity, a certain antioxidant, anti-wear, anti-corrosion and viscosity and other performance requirements, so deterioration of the oil Can not join the engine.
Causes of deterioration of oil
Oil (all synthetic, semi-synthetic, mineral oil) Shelf life is generally 4-5 years, oil pollution and deterioration of storage is mainly oil and air moisture, oxygen and impurities caused by the contact, so after unsealing the oil must be sealed.
Effect of moisture on the shelf life of engine oil
Under normal circumstances, the water content of the oil is less than 0.03%, when the water content exceeds 0.1%, the oil additives (antioxidants, detergent dispersants, etc.) will fail to accelerate the oil oxidation process. Acid and the exhaust of the engine acid oxides react with water to produce inorganic acids, which increase the corrosion of the engine.
Therefore, when the oil contains more water, oil lubricity will deteriorate, the viscosity decreases, ranging from premature deterioration of oil and mechanical parts rust; heavy cause the engine to hold the shaft, burning tiles and other serious mechanical accidents.
Effect of oxygen on shelf life of engine oil
Oil consists of base oil and additives, although the base oil is generally relatively stable, but its stability in the role of additives in oil is much weaker, in the face of oxygen in the air is very easy to produce chemical reactions, especially in the sunlit environment Under, leading to deterioration of additives, greatly reducing the oil oxidation resistance, cleaning and other characteristics.
Impurities on the shelf life of oil
Impurities mainly affect the cleanliness of the oil, the oil mixed with impurities will affect the lubricating effect of oil, and even lead to abnormal wear and tear of the engine, thereby affecting the sealing performance.
After opening the oil preservation method:
Know the causes of oil pollution and deterioration, the following understanding of the method of preservation of oil after unsealing.
1. Immediately after opening the seal, maintenance in the 4S shop or repair shop is completed, the bottle cap should be immediately screwed.
It should be noted that, as the original tin foil film has been damaged, the rest of the cover pad isolated role is limited, this time can be used to clean a plastic film cover the bottle, in order to avoid damage to the best folded several times after the set, and then Then screw on the bottle cap, so that the sealing effect is better.Conditions can also be drip wax seal at the bottle cap.
2. Oil bottle sealed need to be stored in a cool dry place, and to ensure that the sun will not shine, to avoid oxidation inside the oil reaction.
3. Remove the long-stored oil in the next maintenance, do not completely into the process of adding to the engine should be retained, in general, for a long time to store the bottom of the oil bottle there will be a slight amount of water, added to The performance of the engine can affect its performance even with adverse effects.
Generally, the used oil seal storage period varies according to the type: mineral oil storage for 6 months is not a problem; semi-synthesis can be stored for 9 months; fully synthesized can be stored for 12 months or longer. A type of oil, this time enough to support the car to the next maintenance.
