What does 0W 30 mean, and what is the difference between 0 30w and 0 40w?

The meaning of 0w-30: the applicable temperature range of the engine oil, that is, the grade of the lubricating oil (engine oil). 0w is the viscosity of the lubricating oil, where w stands for multi-grade engine oil or all-season engine oil, and some interpretations mean "winter".

30 means that the minimum applicable temperature is -30 degrees.

"W" is the grade mark of SAE, which is the abbreviation of the Society of Automotive Engineers in English. For example: SAE15W-40, SAE5W-40, "W" means Winter, the more ** the number in front of it, the better the low temperature fluidity of the oil, the lower the ambient temperature available for use, and the better the protection ability of the engine during cold start; The number after the "W" (after a horizontal line) is an indicator of the high temperature resistance of the engine oil, and the higher the value, the better the protection performance of the engine oil at high temperatures.

It is the applicable temperature range of the engine oil. The smaller the number in front of w, the better, and the bigger the number after w, the better.

0W-30 is the grade of lubricating oil (engine oil), where 0W is the viscosity of lubricating oil, where W stands for multi-grade engine oil or four-season engine oil, and it is also interpreted as "winter". 30 means that the minimum applicable temperature is -30 degrees. The highest grade of engine oil should be 0w-40, I believe you will know what it means after reading the above.

The common type of oil is high power density tank engine oil, which is mostly used in cold areas and has a high viscosity.

1. The viscosity is different

The number after w refers to the viscosity of the oil at 100 degrees Celsius, and the higher the number, the more viscous the oil. 30 means the viscosity is in between, and 40 means the viscosity is in between.

2. Different liquidity:

The difference between 0W-30 and 0W-40 is that 0W-30 has relatively better fluidity and is more capable of reducing fuel consumption problems and making the engine dissipate heat faster and better.

3. The engine noise is different

For some older cars, using 0w-30 results in more engine noise than using 0w-40.

4. Fuel consumption is different

Some models themselves require the use of 0W-40, and if you choose to use 0W-30, it will consume more fuel than normal.

The oil designation indicates its viscosity specification

For example, in "15W W-40", "W" means Winter, and the higher the number in front of it, the better the low temperature fluidity of the engine oil, the lower the ambient temperature that can be used, and the better the protection ability of the engine during cold start, such as 5W represents the external low temperature resistance of -30 °C, and the low temperature resistance of 20W is -15 °C.

The number after w represents the kinematic viscosity of the oil at 100, and the higher the value, the higher the viscosity. 40 represents 100 degrees Celsius, and the kinematic viscosity standard is between to, which is definitely not what some people say can be used below 40.

The above content refers to Encyclopedia - Engine Oil Labeling.

0-20W and 5-30W are engine oil models, which are different in terms of minimum temperature, high temperature viscosity and oil specifications

1. The engine oil is suitable for different applications. 0-20w engine oil is more suitable for areas with low temperature all year round; And 5-30w is suitable for areas with high temperature all year round.

2. The minimum starting temperature is different. The minimum operating temperature of 0-20w engine oil is -35; The minimum operating temperature of 5-30W oil is -30.

3. The viscosity of engine oil is different at high temperature. The viscosity of 0-20w oil at high temperature is worse than that of 5-30w, so the applicability of 0-20w engine oil at high temperature is worse than that of 5-30w engine oil.

0w20 and 5w30 are two completely different types of engine oil, 0w20 is mainly used in Japan, the United States, South Korea and other automobile engine clearance is larger. 5W30 is mainly used for German and other automobile engines with more fine engines. In short, following the manufacturer's guidance is the most scientific.

Difference between 0w20 and 5w30 oil:

The meaning of each number and letter of 0w20 engine oil is: 0 represents the low temperature viscosity coefficient of engine oil, the smaller the value, the smaller the viscosity of engine oil, and the better fluidity of engine oil; W refers to winter oil, and the number after "W" is an indicator of the high temperature resistance of the engine oil, the larger the value, the better the protection performance of the engine oil at high temperatures.

0W20 engine oil, the minimum operating temperature is -35, which also means that the freezing point of the engine oil is -35, 5W30 engine oil, the minimum operating temperature is -30, except for the Great Northeast of China, 5w engine oil is all applicable, and the owners do not need to worry about the freezing point of the engine oil. The viscosity coefficient of 0w20 oil is smaller than that of 0w30 oil, which means that when the engine is working, the internal resistance will be smaller, and the fuel consumption of the vehicle is relatively low.

Precautions for choosing engine oil:

1. The selection of engine oil should be selected according to the requirements of the engine, and it is not necessary to use too high-grade engine oil on the engine with lower requirements, nor can the lower-grade engine oil be used on the engine with higher requirements.

2. Multi-grade oil should be selected as much as possible, and multi-pure fiber grade oil has a good protective effect on the engine due to its saving, long life and high efficiency. Based on the characteristics of multi-grade oil, there may be premature blackening and oil pressure less than ordinary oil during use.

3. The quality of some domestic brand-name engine oil is quite good, and it is much lower than that of similar imported products, so it can be used with confidence, and there is no need to blindly pursue "foreign oil".

4. If the engine is in good condition and the temperature is low in season, the oil with low viscosity should be used as much as possible to make the oil circuit smooth. For example, in the hot season or under the condition of severe engine wear, the selection of high viscosity oil is conducive to the formation of oil film and reduces engine wear.

What is the difference between 0w30 and 0w40? The following are the differences between 0w30 and 0w40: 1. The viscosity is different

The smaller the number in front of the engine oil label W, the lower the low temperature viscosity, and the larger the number after the W. The smaller the number before W, it means that the low temperature viscosity is smaller, the better the low temperature fluidity, and the applicable minimum temperature is lower, for example, 0W is better than the low temperature fluidity of 5W, if there is a number behind, such as 30, 40, etc., this is the viscosity of the engine oil at 100 °C. 2. Different types of engines are applicable: due to the different viscosities, the types of engines applicable to the two are also different.

In terms of low-temperature fluidity, these two oils are about the same, but the viscosity of the slag 0w40 oil will be higher than that of 0w30, so the use of Fang Songzhi front in the engine, 0w40 is suitable for turbocharged engines, and 0w30 is better for naturally aspirated engines. @2019

OW20 and OW40 are the labels of motor oil, and the higher the number, the higher the viscosity of the oil. The specific differences are as follows:

W20 and 0W40 both start with 0W, indicating that the low temperature viscosity of the two oils is the sameThe key difference is 20 and 40 after w, the number represents the kinematic viscosity of the oil at 100 degrees, the kinematic viscosity of oil 20 at 100 degrees is 8-9, and the kinematic viscosity of 40 oil is around the same. The higher the value, the thicker the oil film at high temperature, and the stronger the shear resistance at high temperature. The high-temperature shear index of No. 20 oil is generally not higher, while the high-temperature shear index of No. 40 oil is above. The fluidity of the high-temperature fiber index of 0w40 is worse than that of high-temperature of 0w20.

2. According to different engine design requirements, match No. 20 and No. 40 engine oil.

No. 20 oil is mostly used in new models of Japanese, Korean and American models, and No. 40 oil is mostly used in German, high-displacement, high-power performance models.

3. The high temperature shear resistance of OW20 and OW40 engine oil is different.

0w40 oil is higher than 0w20 oil, and 0w40 oil can provide a stronger and thicker oil film. 0w-40 high temperature protection ability is stronger, the higher the viscosity of the motor oil.

When choosing an oil, there are the following considerations:

The choice of engine oil should be selected according to the requirements of the engine, and it is not necessary to use too high-grade engine oil on the engine with lower requirements, and it is not necessary to use the lower grade oil on the engine with higher requirements;

Multi-grade oil should be selected as much as possible, multi-grade oil due to saving, long life, high efficiency, has a good protective effect on the engine, based on the characteristics of multi-grade oil, there will be premature blackening in the process of use, the oil pressure is smaller than ordinary oil, which is normal.

Since engine oil has a great impact on the performance and life of the engine, the same series, use grade and viscosity grade of engine oil should be selected in strict accordance with the provisions of the automobile instruction manual.

The differences between 0w20 and 0w40 are as follows:

1. The fluidity of high temperature is different.

The high temperature fluidity of 0w20 is better than that of 0w40, and in the parameters of engine oil, w means winter. The number in front of w represents the fluidity of low temperature, the smaller the number means the better the fluidity of low temperature, the number behind w represents the fluidity of high temperature, that is, viscosity, the smaller the number means better fluidity, and also indicates that the viscosity is lower.

2. The shear resistance at high temperature is different.

The shear resistance of 0w40 oil is higher than that of 0w20 oil, 0w40 oil can provide a stronger and thicker oil film, and 0w40 high temperature protection is stronger, and the higher the kinematic viscosity of the oil. The higher the shear resistance of the engine oil, the better the stability of the oil film and the better the engine protection ability, and once the engine is running at high speed, the oil film is torn because of insufficient strength, which will lead to wear.

Oil Features:

The engine is the heart of the car, and there are many metal surfaces in the engine that rub against each other, and these parts move fast, the environment is poor, and the operating temperature can reach 400 to 600 meters. The new technology turns natural gas into crystal-pure, fully synthetic base oils, which are complemented by unique power cleaning technology to create an oil with superior cleaning protection.

Under such harsh working conditions, only qualified engine oil can reduce the wear of engine parts and prolong the service life. Synthetic oil is divided into synthetic and semi-synthetic, and base oil is mainly divided into two categories: mineral base oil and synthetic base oil.

0W-20 and 0W-40 are two different oil viscosity grades, and the difference between them is mainly in the applicable temperature range and the environment in which they are used.

First of all, zero W indicates the fluidity of the oil and the pump-side dispersion performance during cold start. A lower number indicates that the oil flows and pumps more easily at low temperatures, which is good for starting a cold engine. Therefore, 0W-20 is suitable for cold climates and areas with frequent cold starts.

Secondly, 20 and 40 are the thermal consistency grades of the oil, which indicate the viscosity of the oil at high temperatures. The lower viscosity of 0W-20 allows the lubricant to reach all parts of the engine more quickly, reducing friction and wear. The high viscosity of 0W-40 makes it suitable for high temperature environments and applications that provide a higher level of protection against engine noise.

Therefore, which oil to choose depends on your requirements for the environment. If you're in a cold climate and an area with frequent cold starts, and your engine isn't exposed to extreme heat, the 0W-20 is a better choice. If your vehicle is operating in a hot environment, or if you require a higher level of engine protection, then the 0W-40 may be more suitable.

It's best to choose the appropriate oil grade based on the recommendations of the vehicle manufacturer or the requirements in your vehicle's manual.