0W20 This model of oil is the typical Japanese and Korean models of the favorite oil model, if there is a Japanese and Korean car owners can turn over their own maintenance manual, to see if the number is 0W20 model oil. 0W20 is a relatively low viscosity of the oil, the general German car to use 30 or even 40 oil viscosity, so why japanese cars can use low viscosity oil?
Bar break guide: Most Japanese cars use low-viscosity oil, which does not mean that all Japanese models use low-viscosity oil, nor does it mean that other brands have not used low-viscosity oil, such as GM.
Is the lower the oil label, the better?
To figure out this problem, first of all, let's talk about the oil label, 0W20, where W represents the low temperature performance, the lower the number in front, the better the fluidity at its low temperature, the number in front of the W minus 30, is its lowest applicable temperature, for example, 0W20 is suitable for the environment of the lowest minus 30 degrees, and the 20 after the W indicates the viscosity of the oil, the larger the number, the higher the high temperature viscosity.
The higher the viscosity, which means that in the case of high temperature, the better its tightness, the better the protection of the engine, but the viscosity is not the higher the better, the use of high viscosity oil will often consume more fuel, but also will cause the engine low temperature start difficulties, poor cooling performance, power loss and other issues, the use of low viscosity of the oil, may be able to save fuel, but the most important thing is to adapt to the vehicle, otherwise it is very likely to cause abnormal engine wear. Therefore, the choice of suitable oil label is the most important, according to the recommendation of the car company to choose the oil can be.
Why can Japanese cars use low-grade motor oil?
The Japanese system has long recommended the use of 5w20, 0w20 such low viscosity oil, low grade oil protection is poor, is not afraid of affecting the lubricity of the engine? Or is it that the engine of the Japanese car is more sophisticated, so it can use low-grade oil? In fact, this matter should be from the engine design and the material of the oil.
First of all, we must figure out a sequence, Japanese cars are not because of the precision of the engine to choose low-grade oil, but in order to save fuel, in terms of engine design, it has been moving closer to the direction of adding low-grade oil.
About the end of the last century, the Japanese car manufacturers began to develop in the direction of "low viscosity oil", on the one hand, in order to save fuel, on the other hand, when the Japanese car took the lead in launching the VVT variable timing valve engine, and later they found that this system, it is best to use low-grade oil, reduce the engine VVT system work delay, so the direction of the use of low-grade oil is so fixed.
So how to solve the wear problem? That can only start from the oil body, therefore, you will find a phenomenon, the label is 0W20 oil, the vast majority of it is a fully synthetic oil, only honda green barrel is a very small number of semi-synthetic oil, mineral oil is almost non-existent, this is mainly because the full synthetic oil is built on the four or five types of high-quality "base oil", by adding friction adjusters, to maximize the shear resistance of the oil.
Therefore, Japanese cars can use low-grade engine oil, can not be completely equated with the precision of the engine, but with the design characteristics of the engine is closely related, but ah, this is all for the ordinary Japanese food buying car, if it is fierce driving, do not care about the Japanese- Korean German-American domestic production, all have to increase the high-grade oil.