Why are more and more cars starting to use low-viscosity oil?
Why are more and more cars starting to use low-viscosity oil? Some people say that the implementation of National emission standards is only one of the reasons. There are many advantages of low viscosity oil, such as good low temperature fluidity, reduced engine running resistance, lower pump oil pressure and so on. Therefore, the future choice of low-viscosity oil is an inevitable trend.
Why are low viscosity oils becoming more and more popular?
There is a certain relationship between the fuel consumption of an automobile and the viscosity of the oil used in the engine. The research shows that the use of 0W-20 relative to 5W-30 can reduce fuel consumption under other conditions unchanged. As a result, automakers need to build vehicles that fully meet emissions requirements.
Low viscosity oil can be popularized, engine technology progress is one thing. Whether an engine can use a lower viscosity oil depends more on the area of the friction surface of the relative moving parts. The same load is borne with a larger contact area, which can reduce the impact of the load on the oil film, and naturally the oil viscosity can be lowered.
In fact, the popularity of low viscosity oil is inseparable from the application of high compression ratio, EGR (waste recycling), double cycle technology. As the compression ratio becomes higher and higher, the heat generated by the compressed air of the same volume becomes larger and larger. Reduce combustion chamber temperature and improve emission; Atkinson cycle is a typical low temperature cycle. Therefore, the development trend of fuel engines over the years is not only a high compression ratio, supercharging, miniaturization, but also a process of low temperature. As the engine operating temperature drops, so does the natural oil viscosity.
The inherent fluidity of low-viscosity oil is better than that of high-viscosity oil, so the pumping pressure of the oil pump is lower, so the lower power oil pump can be popularized, which is the cost advantage. Therefore, the purpose of the popularity of low-viscosity oil is not only to save fuel.
Why does low viscosity oil save fuel?
At low temperatures, oils with lower viscosity flow better, reducing the resistance of the engine when running. On the other hand, the better fluidity of the oil pump pump pressure requirements are lower, to know that the oil pump is also from the engine to obtain the power of operation, the oil pump from the engine demand force is reduced, then the loss of the engine is reduced, so the low viscosity oil is fuel efficient.
In short, low-viscosity oil is really fuel efficient, so most car brands have begun to use low-viscosity oil. The cryogenization of the internal combustion engine is a trend, and the engine temperature decreases, and the oil viscosity decreases accordingly. Compared with the high viscosity oil of the past, the low viscosity oil has better flow and better cold start. Of course, there may be insufficient protection ability when the high load is running, but the problem is that the daily drive, buy food, how many can open the temperature to a high level? Most of the vehicle water temperature meter Pointers are up to the conventional scale, so the use of high-load, full-load vehicles is ultimately a very individual behavior. Moreover, today's oil additives are far better than in the past, and the boundary lubrication ability is stronger, which makes up for the disadvantage of low-viscosity oil to a certain extent.
