Deep understanding of lubricant knowledge, better car care heart
Lubricating oil is not unfamiliar to the owner of the car, but the real understanding of the role of the lubricating oil and the selection of the appropriate is relatively small. Has always been recommended by the maintenance master what to use, as a qualified driver should know about the lubricant If the car is like a human, the frame is the bone, the body is the body, the headlights are the eyes and so on. The engine of the car is the human heart, the engine is the most important and most complex part of the car. Lubricating oil is human The blood is so important, the engine can maintain a good condition by relying on the maintenance of the lubricating oil. If the lubricating oil has a problem, the engine will be tempered on that day. If it is serious, it may strike directly. What is the specific effect of the lubricating oil? What kind of object is it composed of? What is the difference between good and bad? Are there any standard indicators that can be easily identified? The following explanations can help you increase your understanding.
I. Lubricating oil has five major effects on the engine
2. What is the composition of the lubricant?
A combination of base oils and additives, different grades of base oils and different formulas of additives will produce different lubricants. This is an important reason for the difference in quality and characteristics of each brand, and the price difference is also based on The level of base oil is differentiated.
How is the base oil produced? The following is a detailed explanation.
The base oil is an important raw material for lubricating oil. The raw materials are not good. Of course, the finished products are not good there. Therefore, the lubricants currently circulating on the market are generally all synthetically based on three types of base oils, and some brands pursue more. Good quality, will use four or five base oils, even higher grades of high density base oil.
3. Lubricants are visible, tangible but not good or bad, only by the logo of the package to identify the quality and label (this information can only be for genuine, counterfeit imitation does not apply). Standard There will definitely be quality grades on the lubricant packaging, viscosity, whether the total synthesis and the base oil are all marked out, it is up to us to slowly identify it!
1. First understand the level of lubricants, currently recognized by the 'American Petroleum Institute' English Sketch API International Lubricant Certification Agency.
The beginning level of S is representative of gasoline engine oil. Specifications are: SA, SB, SC, SD,
SE, SF, SG, SH, SJ, SL, SM, SN.
The beginning level of C is representative of diesel engine oil, the specifications are: CA, CB, CC, CD,
CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4, CJ-4.
For each increment of the above letter, the quality level of the lubricating oil will be better than the former one, and the higher the letter, the higher the environmental protection level.
The basic lubricants on the market are marked with SM, SN. Is there any real recognition by the API agency? We can confirm it through the official website of the API. According to the knowledge, there are only about 4,500 brands with API certification in the world. However, there are already more than 8,000 lubricant brands sold in China alone. In the end, Li Wei or Li Gui! The official website will know.
2. Understand the viscosity identification of lubricating oil. The viscosity level marking generally uses the English abbreviation SAE of the American Society of Automotive Engineers, for example: SAE5W-30, SAE5W-40, etc. The viscosity label of the lubricating oil behind the SEA is a popular explanation. 'W' means winter (winter). The smaller the number in front of W, the better the low-temperature fluidity of the lubricant. The lower the ambient temperature that can be used, the better the protection of the engine during cold start.
The number behind W is the indicator of the high temperature resistance of the oil. The larger the value, the better the protection performance of the oil at high temperature. This statement is correct, but many people still don't know much. There are also online summers. What is the meaning of oil, winter oil and four season oil? This is actually a selling point that the seller deliberately makes, making the owner more confused. Here is a simple and concrete explanation.
Simply put, the smaller the number in front of W, the stronger the cold resistance and the better the liquidity.
The higher the number after the horizontal crossing, the higher the viscosity, the better the protection and sealing performance of the engine, but the high viscosity is very fuel-intensive and the engine running load is large. The smaller the number, the smaller the viscosity, the easier the engine is and the more fuel-efficient. But it is easy to be noisy. Therefore, it is not the choice of bigger or smaller, the most important thing is to use the engine.
For example: Honda Fit 1.6 displacement manufacturer's guide is 0W-20, what if it is changed to 10W-40?
The engine sound is very steady, but the fuel is not strong, it is necessary to increase the normal throttle more than half of the throttle to run.
Fuel consumption has also increased by more than 30%. But with 0W-20 back, it accelerates smoothly and saves fuel. This is the difference between different labels.
Therefore, according to the guidelines of the car manufacturer, it is better to choose the appropriate label! The most commonly used lubricant on the market is 5W-30. This is the reason. The low temperature capability of 5W covers many areas, and the fluidity is better. The viscosity of 30 is moderate. Therefore, it is correct to say that 5W-30 is a general-purpose oil. Is it all that can be used with 5W-30? When choosing a lubricating oil, the old and new parts of the car must be considered. The gap between the engine parts of the new car is small, and the viscosity should be selected. Smaller lubricants, for example: The depot guidelines are 0W-20 or 5W-30. However, there are already many wears in engines over 100,000 km, and the component clearance is larger than that of the new car. In this case, choose the original label. Viscosity will be better, for example: Originally 0W-20, 100W should be used after 100,000 km, the original is 5W-30, 100W after 100,000 km.
Another situation is violent driving. If the driver of long-term violent driving (commonly known as: floor oil) should also choose the car manufacturer, it is better to protect the engine with a higher viscosity oil. For example: The car manufacturer recommends using 0W-20. 0W-30, the car manufacturer recommends 5W-30, choose 5W-40.
4. How long is the general replacement cycle of lubricating oil? Lubricating oil is subjected to high temperature during use, and the action of air and metal catalysis may be mixed with sludge generated by fuel combustion, carbon deposit, water, acidity and incomplete combustion products. Etc. Will significantly reduce the performance of the lubricant, while the viscosity increases easily adhere to the gap of the engine is not removed.
Many lubricants on the Internet are marked with 15,000 km of use, even with a mark of 30,000 km. If equipped with their special long-life oil filter, it may have such long-term ability. But the general oil filter on the market is only 5000~8000. The long-term effect of kilometers, even the best brands are only marked about 10,000 kilometers. So it is best not to listen to them, generally recommended to replace 6000 ~ 10000 kilometers.
The above introduction of the common sense of lubricating oil does not know whether we can understand it easily. If the lubricating oil is used correctly, the engine can run more smoothly. The speed increase obviously feels a lot lighter. In the future, you can save a lot of worry. I hope I can have it for everyone. Help