No! Jiaxiaobian yuan wechat "rhyayuan", invited to enter the largest wechat group in the industry - "lubricant tar powder group"
First send out a picture to see the viscosity of various oils and their main application scope at present:
Check the viscosity and common range of oil on the market
Now, let's start to share and study the theory summarized over the years. It can be said that to understand the model of oil, there is nothing like a condom, the most vivid image to help understand. I also hope this article can help the chefs of the automobile repair shop to explain it lively and interesting, so that the majority of car friends really know how to distinguish engine oil models.
Must the imported one be good? not always!
Adaptability is crucial. I remember someone bought a lot of condoms from abroad before. They said that foreign standards are high and the quality is the most reliable. At last, none of them can be used, because the size is too big! The selection of engine oil is related to the model, driving environment, traffic conditions and personal driving habits of the region. Some imported engine oils may be very good in the local environment abroad, but they may not be suitable for China's national conditions. Therefore, many international brands of engine oil will basically set up blending plants in China, or directly mix products suitable for China in foreign production bases.
It is important to choose the right model
0210W-40→5W-40→0W-40，
What's the difference?
As I explained in the previous article, the value in front of W represents how cold the engine oil model can be used normally. In addition, the value actually reflects the speed of its cold start. The smaller the value is, the faster the cold start speed will be, and the faster the oil can lubricate and protect the contact parts inside the engine, so as to reduce the cold start wear. To put it in a popular way, the hot car time of 0W is the shortest. This is a bit like the time of foreplay. Do you like foreplay longer or shorter? Five minutes for charging and one hour for working? Or charging for five minutes an hour?
030W-40→0W-30→0W-20→0W-8，
How to understand?
The value after "-" represents the viscosity of oil at 100 ℃, which is abstract and hard to understand. In short, the larger the value is, the thicker the oil film is at high temperature. Of course, the higher the resistance is at running time, which will consume more power of the engine. Different engine manufacturers will have different engine power, load, precision, piston / cylinder wall clearance, adjustment, etc., so different oil viscosity will be recommended. For example, over running belongs to high power rate and high load engine. If low value is selected, the engine will be damaged because the oil film is too thin and the oil film strength is not enough. For many Japanese cars, the piston / cylinder wall clearance is small, so the viscosity is very low.
At present, the viscosity of engine oil is getting lower and lower for the goal of environmental protection, energy saving and emission reduction. The lower the viscosity is, the smaller the internal resistance is, the faster the throttle response is, and the lower the fuel consumption will be. However, when selecting, it is necessary to follow the recommendation of the engine manufacturer, and never replace the 0w-40 with the 0w-20. However, individuals tend to use the lower viscosity as long as it is within the engine manufacturer's recommendations.
▲ compare the viscosity difference of oil with the type of condom
04 oil too thin = insufficient protection, easy to wear?
Can you understand after reading the above picture? The current trend is low viscosity, but it is necessary to follow the recommendation of the engine manufacturer. Do not use the engine indiscriminately. If the oil is too thin, it may cause insufficient pressure, cylinder pulling, tile burning, etc. it must match your engine. Low viscosity engine oil, try to choose a large brand of high quality, regardless of high temperature resistance, oil film strength, etc., relatively higher. It's like buying a box of "ultra thin" or "thin air" condoms. Big brands are more reliable when they use them. Otherwise, they always worry about breaking them. What's the fun!
Source: cat at 3:15 a.m. (this platform is dedicated to industry sharing and exchange, and the article does not represent the platform's views. The copyright belongs to the original author.
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