Why do Japanese cars use low viscosity oil?

【 Master Bang 】 Why do Japanese cars use low viscosity oil?

Throughout the history of the automobile, the rise of the Japanese automobile industry is precisely based on the two characteristics of its products: inexpensive and energy efficient. With these two points, Japanese cars have gradually reached the peak of sales since the 1980s.

Therefore, the Japanese car people, who like to do things to the extreme, decided to implement "fuel saving" to the end, including the development of low-viscosity, high-efficiency oil. Today, we will come and deeply dig down, why do Japanese cars use low viscosity oil ~

What is the effect of oil on fuel consumption

1

Low viscosity oil reduces engine motion resistance

Low viscosity oil can reduce the friction resistance between components, that is, the operating resistance inside the engine.

2

Different speed, low viscosity oil fuel saving effect is different

Many manufacturers have carried out experiments on low-viscosity oil, and the results found that the reduction of the internal running resistance of the engine can indeed save fuel.

However, different parts of the engine at different speeds, the demand for oil viscosity is not the same, for a small number of parts, low viscosity oil is not necessarily better, and even have certain side effects.

3

Low viscosity oils are the most fuel efficient in daily use

Experimental results show that within the range of 1000 to 3000 RPM, low-viscosity oil has the least side effects and the most obvious fuel saving advantage, and out of this range, the fuel saving effect is not so obvious.

What are the characteristics of low viscosity Japanese cars

1

VVT technology

Japanese engines have always been known for their reliability and fuel saving, which of course cannot be separated from the support of VVT technology.

VVT engine is different from the general engine, first of all, the oil circuit design is very particular, because when adjusting the valve advance and delay Angle, the operation is completed by oil promotion.

In order to ensure that the VVT can work in a timely and accurate manner, the VVT engine has very high requirements for the fluidity of the oil.

If the oil viscosity is too high, it will make the engine VVT work retarded, so the engine with variable timing valve must use low roll resistance and high flow oil. In this way, 0W-20 oil has become the first choice recommended for Japanese cars.

2

High precision component

Automotive camshaft is the engine working pressure is the largest mechanism, the working state is sliding friction, running resistance is relatively large, camshaft processing accuracy affects the engine performance and power output, so it requires a very high processing accuracy.

Japanese automobile manufacturers through precision processing technology to treat the camshaft journal as smooth as a mirror, extremely smooth journal surface on the viscosity of the lubricating oil requirements are greatly reduced.

3

The engine operates at a lower temperature

The optimized design of the Japanese car makes the engine work at a lower temperature, which is the most important condition for the use of low-viscosity oil.

Beijing an oil research institute technical team through the driving test, also at the speed of 100 kilometers per hour, the oil pan oil of the Japanese and Korean cars shows that the temperature is far lower than the temperature of the Volkswagen car, the Japanese car is less than 90 ° C, the Volkswagen car is close to 110 ° C.

Through the experiment, it is concluded that the engine operating temperature is low is the root cause of the Japanese car can use low viscosity oil, the Japanese and the old Volkswagen engine respectively use the viscosity of 5w20, 5W40 oil, the engine operating temperature of 90° and 110° the oil viscosity index is still similar, the lubrication protection effect is good.

Low viscosity oil is toward the goal of energy saving and fuel saving, and has been concerned and studied by Japanese Ovens for a long time;

Low viscosity oils usually use fully synthetic base oils with higher stability and are blended with specially developed additives.

Low-viscosity oils must be matched to high-precision engine components;

However, it is not recommended to blindly change low-viscosity oil in order to save fuel, which needs to vary by car. Car oil selection, suitable for the most important!