What does the w of the oil stand for, for example w40

SAE: is the abbreviation of the Society of Automotive Engineers of the United States, which specifies the viscosity grade of motor oil, the classification viscosity from low to high, (that is, 0w oil viscosity is the lowest, 60 oil viscosity is the highest) there are ten viscosity grades 0w, 5w, 10w, 15w, 20w, 25w.

w"in English"winter"(Abbreviation for winter, meaning contains.)"w"Grade engine oil suitable for use in cold climates in winter. The lower the number, the lower the ambient temperature it is suitable for. For example, the minimum pumping temperature of 5W, 10W and 15W engine oil is -30, -25 and -20 respectively.

The lower the number, the better the fluidity at low temperatures, and the better the wear protection for the engine when it starts at low temperatures. Motor oils are divided into single-grade viscosity oils and compound viscosity oils. SAE30 and SAE40 are single-grade viscous oils.

Most engines that operate above zero degrees Celsius choose single-grade viscosity oils. SAE10W-30 and SAE15W-40 belong to compound viscosity engine oils. In winter, for a quick start, a compound viscosity oil should be used.

The compound viscosity oil can meet the requirements of both high and low temperature environments, and is suitable for use all year round, without the need for seasonal oil changes.

W is on behalf of power, how much w rate the engine outputs per minute, a cylinder 150ml outputs about 30w per minute, so 15w-40w motorcycles can be used.

W is generally winter oil, engine oil is generally 15w to 40It means that it can be used in all seasons.

What does 5w40 mean in engine oil The w in the engine oil model means winter, which is winter. The number in front of the w represents the low-temperature flow properties of the oil, and the number after the w indicates the high-temperature viscosity of the oil.

If it is 5w oil, it means that the oil can flow normally at minus 30 degrees Celsius, and if it is 0w oil, it means that the oil can flow normally at minus 35 degrees Celsius.

The number after w indicates the high temperature viscosity of the oil, and the higher the number, the greater the viscosity.

When choosing an oil, you must pay attention to the viscosity not too high or too low.

If the viscosity is too high, it will cause the operating resistance inside the engine to increase, which will reduce the power of the engine and increase the fuel consumption of the engine.

If the viscosity is too low, it will exacerbate the wear and tear of the engine.

During the normal operation of the engine, the oil will form an oil film on the surface of the various parts in the engine, which can avoid direct contact between the various parts, which can reduce the friction between the various parts.

If the viscosity of the oil itself is relatively low, the oil will not be able to form a stable oil film on the surface of various parts in the engine after it becomes thin, which will aggravate the wear of the engine.

Therefore, when choosing the viscosity of the engine oil, you must choose according to the technical characteristics of your car engine.

In the case of turbocharged engines, it is recommended to use a 40 viscosity oil, and in the case of naturally aspirated engines, it is recommended to use a 20 or 30 viscosity oil.

What does 0w30 mean in motor oil.

W is the abbreviation of winter, which means winter, if there is the letter W in the engine oil model, it means that this engine oil can be used normally in winter. The number in front of the w indicates the low-temperature flow properties of the oil, and the number after the w indicates the high-temperature viscosity of the oil.

If it is 0w oil, it means that the oil can flow normally at minus 35 degrees Celsius, if it is 5w oil, it means that the oil can flow normally at minus 30 degrees Celsius, and if Yeluzi is 10w oil, it means that the oil can flow normally at minus 25 degrees Celsius.

The number after w indicates the high temperature viscosity of the oil, and the higher the number, the greater the viscosity.

The viscosity of motor oil is a very important indicator of motor oil.

The viscosity of the oil should not be too high or too low, and if the viscosity is too low, it will exacerbate the wear and tear of the engine. If the viscosity is too high, it will lead to an increase in resistance when the engine is running, which will lead to a decrease in power and an increase in fuel consumption of the engine.

When the engine is working, the oil will form a layer of oil film on the surface of each component in the engine, which can reduce the friction between the various parts in the engine and also reduce the running resistance in the engine.

If the viscosity of the oil is too low, the oil will not be able to form a stable oil film, which will increase the wear of the engine.

Therefore, when choosing an oil, you must choose the right oil viscosity for your car's engine. (Photo by Q&A: Q&A called the beast) @2019

1. High temperature stability is different.

The number after w indicates the kinematic viscosity of the engine oil at 100, and the larger the number, the greater the viscosity, which means that the guarantee is better and more stable at high temperatures, that is, it is less likely to thin at high temperatures. That is, 5w40 is more stable at high temperatures than 5w30.

2. The objects of use are different.

5w40 has a better viscosity than 5w30, so it is more suitable for old cars, 5w30 is more effective in reducing fuel consumption, making the engine faster and better heat dissipation, and at the same time, it is also less noisy, suitable for new cars or naturally aspirated engines.

The symbol w stands for Winter (winter).

The smaller the number before w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature.

Mainly: 0W, 5W, 10W, 15W, 20W, 25W.

0 means that -35 or more can be used, 5 means -30 or more can be used, and so on, 25 means -10 or more can be used.

1. The winter oil grades of lubricating oil viscosity classification are: 0w, 5w, 10w, 15w, 20w, 25w, the symbol w represents winter, the smaller the number before w, the smaller its low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature.

2. The summer oil grades of lubricating oil viscosity classification are respectively, the larger the number, the greater the viscosity, and the higher the applicable maximum temperature.

3. The general oil grades of winter and summer for the viscosity classification of lubricating oil are: 5w w w w-50. The smaller the number for the winter portion, the larger the number for the summer portion, and the larger the applicable temperature range.

w stands for winter (winter), the more ** the number in front of it, the better the low temperature fluidity of the engine 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.

Engine oil 5w40 and 0w40 are the labels of gasoline, where 40 represents viscosity, the larger the number, the greater the viscosity, the higher the applicable maximum air rise and blind temperature. This means that the maximum ambient temperature that 5w40 and 0w40 can adapt to is the same, and high-viscosity oils (with higher values) may also be more suitable for high-speed or heavy-duty vehicles.

The lower the number before w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature; Therefore, the use of engine oil 5w40 is higher than 0w40, and the oil with a lower value in front of w can easily start the engine in cold weather.