A powerful engine can provide the power output of the vehicle, so the engine that keeps the engine running for the longest time is the engine oil. I believe many of my friends are familiar with car engine oil and know that it is an indispensable lubricant for car engines. But many friends may not know what its real role is. Why do I need to change the oil regularly? How to choose oil? Today, the author briefly introduced oil related knowledge, so that car owners can better understand how to use car oil. ◆ Development history of automobile oil In fact, the time for humans to control lubricants began as early as 3,500 BC. At that time, mankind had learned how to reduce the friction between objects and objects. The earliest record was that in Egyptian tombs 3,500 BC Some of the animal fats retained in ancient tanks were used as lubricants in animal fats and were also used in the construction industry. The wood tracks carrying large stone materials were continuously added with lubricants. The time for animal and vegetable oils to act as lubricants continued until 19 In the early years of the century, mineral oils began to replace animal and vegetable oils as the primary lubricants until oil was discovered. Since the discovery of oil, people began to extract mineral oil from oil to act as a lubricant. Early oils were completely composed of mineral oil. With the continuous development of the industry, the degree of leanness in machinery has increased, and the quality of lubricants has been improved. It is also continuously improving. The addition of additives to mineral oils makes the quality of mineral oils even better. The scope of application is More extensive. Due to the limitation of the basic properties of mineral oils, synthetic lubricating oils and semi-synthetic compounds artificially synthesized by chemical methods have been created. lubricating oil. ◆ Classification and Function of Automobile Engine Oil With the continuous development of industry, the types of lubricants used in machinery are also being continuously subdivided. This article refers specifically to the oil used in the internal combustion engine of an automobile. The oil used in internal combustion engines (also known as lubricants) is mainly divided into two parts. One is mineral oil, which is mentioned earlier. The other is synthetic motor oil. Synthetic motor oil is divided into fully synthetic engine oil and semi-synthetic motor oil. In terms of composition, full synthetic oil does not contain mineral oil, while semi-synthetic motor oil contains a small amount of mineral oil. Mineral oil is extracted from petroleum and added after adding additives. The cost is relatively low. Synthetic motor oils are chemically synthesized and costly, but they have better high- and low-temperature performance than mineral oils and have a longer lifespan. Oil is also known as lubricating oil. Many car users know that the main function of oil is to help the engine run with lubrication. However, this is only one of the benefits of oil. In addition to lubrication, friction and friction reduce the oil, it also has cleaning, cleaning and sealing. Anti-leakage, anti-rust anti-corrosion, cooling and cooling, shock buffer effect. Lubrication: The most important role of oil is to form an oil film between the piston and the cylinder. The oil film isolates the friction surfaces of the two parts to reduce friction. Cleansing effect: The oil can be cleaned by recirculating flow in the lubrication system to bring carbon deposits, sludge and some worn out particles on the engine parts back to the oil pan. Sealing function: The oil film formed on the friction surface of the parts of the oil can also play the role of sealing and can prevent air leakage and oil leakage. Anti-corrosion and anti-corrosion: The oil film can be adsorbed on the surface of the parts to prevent moisture and air from contacting the parts to prevent oxidation corrosion. Cooling: The oil flows through the oil system to bring part of the engine's heat back to the oil tank and disperse it, helping to cool the engine. Shock-absorbing cushioning: When the engine starts, the cylinder port pressure rises sharply and abruptly intensifies the load on the piston, piston pin, connecting rod and crankshaft bearing. This load is transmitted through the bearing and lubricates, absorbs shock and reduces vibration, and acts as a buffer. . ◆ How to use the oil type to read the oil? I believe many of my friends pay more attention to those markings on the oil packaging, such as API, 5W-30 and other numbers, then what do they mean? Let's explain it for everyone. The meaning of the SAE label: SAE is an abbreviation of the English "American Society of Automotive Engineers", followed by a number represents the viscosity of the oil, such as SAE5W-40, 5W behind the SAE represents its low temperature fluidity, "W" is WINTER ( (Winter) abbreviation, the smaller the number in front of W, the better the fluidity of the oil at low temperatures, that is, the better the engine's protection against the engine at cold start, the number behind the “-†represents the oil At a viscosity of 100°, the higher the number, the higher the viscosity is, that is to say, the better the protection effect on the engine at high temperatures, the SAE label can directly reflect the applicable temperature range of the oil. "0W" resistant to external low temperature -35 °, "5W" resistant to external low temperature -30 °, "10W" resistant to external low temperature -25 °, "15W" resistant to external low temperature -20 °, "20W" resistant to external low temperature -15 °, "25W" resistant to external low temperature -10° The meaning of the API label: "API" is an abbreviation of the American Petroleum Institute. The API label represents the oil quality level, but the quality here does not directly represent the anti-wear effect, but the "integrated oil quality" including the environmental protection level. API markings are divided into "S" beginning gasoline engine oil, "C" beginning diesel engine oil, and "S" and "C" common gas and diesel common oil. The applicable specifications for "S" at the beginning of the applicable gasoline are: SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN The applicable specifications for "C" at the beginning for diesel are: CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4 In fact, the grade behind the letter S is not its lubricating effect, but more of its environmental performance. The better the environmental performance, the better the oil can effectively reduce the heavy metal content. ◆ Matters needing attention when replacing oil 1. When to change the oil: If you choose to go to the 4S shop for oil change, you should follow the time given in the vehicle maintenance manual. The general vehicle maintenance cycle will be performed within 5000-10000 km, or within 6 months to one year. If you choose to buy oil for your own replacement, you can use the selected oil to determine the next replacement time, which also reflects the difference in the use of mineral oil and synthetic oil mentioned before, general mineral oil is recommended within 5000 km or six months to be replaced, semi-synthetic engine oil is recommended to be replaced within a 7500 km or six months, fully synthetic motor oil is recommended to be replaced at 10,000 km or six months. 2. How to tell if you need to change the oil: 3. How to check the oil level: Some models suffer from excessive oil loss. The owner can regularly check the amount of oil in the vehicle. If the oil is worn out excessively, the engine oil should be added or replaced in time. 4. Can the oils of different brands and labels be mixed? 5. Are all models suitable for fully synthetic engine oil? I believe many people think that full-synthetic engine oil represents the high quality of engine oil and they don't hesitate to use full-synthetic engine oil at high prices. In fact, the use of full-synthetic engine oil is a good choice for most models. The low-temperature fluidity of synthetic motor oil is very good. Well, compared to semi-synthetic motor oils and mineral oils, the viscosity of the oil film is relatively thin because of its low viscosity, but due to the thinner nature of the oil film, for some old vehicles and some processes that are not fine enough for low prices In the case of vehicles, the internal parts of the engine may be damaged due to the large gaps between the parts. The oil film of the fully synthetic motor oil does not function as a good seal, and it is prone to burning oil. to sum up: After reading some of the basic knowledge of the oil in the article, I believe that you have a certain understanding of the meaning of different labels for oil. If you want to buy oil for replacement, this information can provide you with help. For the choice of oil, it should still have a sufficient understanding of their own vehicles, according to their own vehicle conditions to change the oil and select the oil is the most sensible choice. Dongguan Huayuan Electronic Technology Co., Ltd , https://www.huayuanelectronic.com