[Original Truck House] is a common consumable for old drivers, but do you really know it? Do you know how oil is classified? This issue of accessories knowledge will reveal the secret of engine oil for you.
Engine oil has always been known as the "blood" of automobiles. It is mainly used for lubrication, which can reduce the wear of engine parts and help the engine to dissipate heat. However, there are so many types of engine oil that it is difficult to decide which one is the most suitable for your car. Let’s take a look at how the engine oil is classified.
● Classification according to composition from the essence
According to the composition of engine oil, it can be divided into ordinary mineral oil, semi-synthetic engine oil and all-synthetic engine oil.
1. All of synthetic engine oil
Mineral oil is a common lubricating oil. It is made by fractionating useful substances during petroleum refining, and then processing and extracting the remaining bottom oil. Mineral oil has low price, poor service life and lubricity, and strong pollution. Mineral engine oil is changed every 20,000 kilometers, and the replacement cycle is short, which is too much trouble for trucks running long distances.
2. All of synthetic engine oil
All synthetic engine oil is to refine ethylene and propylene dispersed from gas or natural gas in crude oil into lubricating fluid composed of macromolecules through complex chemical reactions such as polymerization and catalysis. It is through artificial chemical reaction of better components in crude oil to achieve the expected molecular form. This kind of engine oil has strong resistance to external variables, good thermal stability and strong resistance to viscosity change, and the general oil change cycle can reach 40 thousand kilometers.
3. Half synthetic engine oil
Semi-synthetic engine oil is made by mixing the products purified by hydro-fission of mineral engine oil with all synthetic engine oil in a ratio of 4: 6. The purity of semi-synthetic oil is very close to that of fully synthetic oil, but its cost is only slightly higher than that of mineral oil, and its lubricating performance and stability are between that of synthetic engine oil and mineral engine oil.
● Classify by quality from the scene.
There is a standard scale for engine oil, namely API, which is the abbreviation of american petroleum institute’s evaluation standard for engine oil quality grade. According to the quality of engine oil, it can be divided into CA, CB, CC, CD, CE, CF, CF-4 and CG-4.
Where c stands for special engine oil for diesel engines, the second letter indicates the quality of the engine oil, and the later the letter indicates the higher the quality of the engine oil. For ordinary cars, CD-grade engine oil can work normally, but it is best to use CF-4 or above engine oil for vehicles with high engine oil requirements like Guoliu.
● Classification by applicable temperature based on characteristics
In addition to the grade, the viscosity of engine oil at different temperatures can also be seen on the engine oil bottle, and the demand for engine oil viscosity is different for different vehicles under different working conditions, so the American Society of Automotive Engineers (SAE) has made regulations on the viscosity grade of lubricating oil.
Its format is generally 5W50.
Among them, 5W represents the service temperature range of oil products, and w is the abbreviation of winter, which stands for low temperature environment. It can be divided into 0W, 5W, 10W, 15W, 20W, 25W and other levels. The smaller the number, the better its low-temperature fluidity, and the better it can work under low-temperature conditions.
50 indicates the viscosity of engine oil at 100℃, and there are 20, 30, 40, 50 and 60 grades in turn. The higher the number, the higher the viscosity.
5W50 means that the viscosity of this oil meets the requirement of 5W at low temperature and meets the requirement of No.40 at 100℃.
● Editor’s note:
As the blood of a car, the choice of engine oil is very important. Today, through the classification of these three aspects, I believe that everyone should have a preliminary understanding of engine oil. Next time you buy engine oil, you can go and see if it is suitable for your car.
Of course, these are just compiled by Xiaobian in the comments of previous articles through card friends. If there are other precautions, please leave a message below and let’s communicate more.