For students who bought a car earlier, the warranty period of the car is basically out, and there is no need to go to the 4S shop during maintenance. It is more convenient to choose a repair shop closer to home, and the price is more affordable. However, this brings about a problem. The oil is the most frequently changed during vehicle maintenance, but the above parameters make many people confused. It’s okay. Read today’s article carefully to know the mystery.
Classification of commonly used engine oils The engine oils currently on the market can be divided into three categories, namelyMineral engine oil, semi-synthetic engine oil, fully synthetic engine oil, The grades of these three oils areFully synthetic motor oilsemi-synthetic motor oil mineral motor oil. In fact, these three types of engine oils are almost imperceptible in the initial stage of use, but as time increases, you can realize the advantages of expensive and expensive. The various properties of mineral oil will decline quickly, and vehicles are prone to problems such as increased noise and power drop earlier, while fully synthetic oil is more stable and can prolong the appearance of this phenomenon.
Judging the performance of the oil from the label After understanding the classification of the oil, let’s talk about the parameters, which are what we often see5W-30/5W-40Or something, this set of numbers is actually calledSAELabel,SAEIs englishAmerican Motor Vehicle Engineering AssociationThe abbreviation for.
WIs the first letter of the English word Winter, which means winterWThe previous number is the flow viscosity at low temperatureWThe following numbers are the viscosity at 100°C and the high temperature shear viscosity
Is the above words a bit confusing, we can simply understand it asWThe lower the previous number, the better the performance of the oil in low temperature conditions, and the better the protection of the engine when the vehicle is started.WThe higher the number behind, the higher the oil viscosity, and the better the performance at high temperatures. You can choose a higher value when running at high speeds. If the road is more congested, choose a lower value.Is this easier to understand? Generally, the label used in our country is5w-30/5w-40The oil is fine, and the oils with these two labels are also very cost-effective.Another important parameter isAPI, Common specifications areSN/SL/SM.
APIIs englishAmerican Petroleum InstituteShort forAPIThe number behind represents the quality level of the oil, in fact it is fromSAAt the beginning, untilSN, Every time a letter is incremented, the engine oil is one grade higher, generally usedSM/SNThe level is completely ok.
ifCAt the beginning, for exampleCA/CE/CFThese represent the grade of engine oil used in diesel vehicles. If the engine oil you use has both marks, it means that it can be used for both gasoline and diesel vehicles. Having said so much, I believe that the students already have a basic understanding. When buying engine oil next time, they will not get caught up in the circle, and they can brag about it in front of friends. Finally, I would like to remind everyone that it is better to choose a high-grade engine oil. It must be selected according to your own car usage and car environment in order to achieve the goal of high cost performance.
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