Many car owners are caring about car care after purchasing a car. For example, in selecting engine oil, many car owners only choose expensive high-grade engine oil. It seems that the higher the number, the higher the price and the more expensive the oil. In fact, it is not entirely clear that we have discovered that many owners have mistakenly added high-grade engine oil, which has led to an increase in the amount of coke deposition. Therefore, in selecting oils, it is the best for their own models. We will read them here today. How to select the engine oil correctly, I hope for the majority of car owners to help. Oil Oil is not just for anti-wear Oil is as important to the engine as blood is to the heart. The engine is the heart of the car. There are many metallic surfaces that rub against each other in the engine. These components move fast and have poor environment. The operating temperature can reach 400°C to 600°C. Under such harsh conditions, only qualified lubricants can reduce engine component wear and extend service life. Between the piston and the cylinder, there is a rapid relative sliding between the spindle and the bearing. To prevent excessive wear of the parts, it is necessary to establish an oil film between the two sliding surfaces. There is a sufficient thickness of the oil film to separate the surfaces of the parts that slide relative to each other, thereby reducing wear. Oil can also bring heat back to the oil tank and then to the air to help the tank cool the engine. Good oil can bring carbide, sludge, and wear metal particles on the engine parts back to the oil tank through the circulation, and flush the dirt generated on the working surface of the parts through the flow of the lubricant. The oil can form a seal between the piston ring and the piston, reducing gas leakage and preventing the entry of contaminants from the outside. Lubricating oil can suck on the surface of parts to prevent contact of water, air, acidic substances and harmful gases with parts. When the engine cylinder port pressure rises sharply, it suddenly increases the load on the piston, piston swarf, connecting rod and crankshaft bearing. This load is transmitted through the bearing and lubricates, so that the impact load that it bears acts as a buffer. The best is the best At present, the oil on the market can be simply classified into mineral oil and synthetic oil due to the difference in the base oil. Synthetic oil is divided into: fully synthetic and semi-synthetic. Full synthetic motor oil is the highest grade. The biggest difference between the two is that the synthetic oil has a wider temperature, a longer life, and a higher cost. With the same oil film requirement, the synthetic oil can be achieved with a lower viscosity, while the mineral oil needs to be used in comparison with the synthetic oil. Thicker viscosity can meet this requirement. In the same working environment, synthetic oil has a longer lifespan than mineral oil, so the cost is higher, but after the number of oil changes, it is not much higher than mineral oil. Different grades of engine oil have different characteristics, and their low-temperature startability and high temperature anti-wear and adhesion also have different performances. The viscosity of the oil is inversely proportional to the temperature. When the engine is cold, the viscosity of the oil is high. If the selected oil is thicker, it will add extra loss to the starter motor and battery, but if the oil is too thin, it will work at high temperature. Under it, it is difficult to form enough protective films to cause insufficient lubrication, resulting in increased wear of the parts. Viscosity of lubricants is often marked with SAEs and other grades. For example: SAE15W-40, SAE5W-40, "W" means winter (winter), the smaller the number in front of it, the better the low temperature fluidity of the engine oil, the lower the ambient temperature representing the available engine, the engine at cold start. The better the protection capacity is; the figure behind the “W†(a horizontal behind) is an indicator of the high temperature resistance of the engine oil. The larger the value, the better the protection performance of the engine oil at high temperatures. Q: What is wrong with the problem of adding fuel oil? A: The normal height of the oil level of the oil is between the upper and lower markings of the oil detection rule. Adding too much oil will cause too much oil to enter the combustion chamber through the splash effect, resulting in coke and increasing the running resistance of all parts in the crankcase. , so be sure to adjust it to the normal level. Q: Do you want to change the oil, do not change the filter? A: The oil is not only lubricated, but also has an important role to take away the dirt inside the engine. These dirt are filtered out by the machine filter. If the oil is not replaced, the dirt cannot be completely removed. Therefore, it is meaningless to change oil. Change oil must be changed machine filter, this is dead rules. Plastic Daily Necessities Injection Machine Plastic Injection Machine,Daily Necessities Injection Machine,Plastic Daily Necessities Injection Molding Machine BOLE INTELLIGENT MACHINERY CO., LTD , https://www.bolemachinery.com