How to explain the label of engine oil, please everyone, thank you

This is the engine oil labeling standard formulated by the API of the American Bureau of Reputation and Wide Petroleum Association, which is usually marked by the method of 5W W W W-40.

This annotation is divided into two parts, the part after the minus sign "-" represents the high temperature shear resistance of the oil at 100, and also represents the basic viscosity of the oil, the larger the value, the higher the shear resistance, the thicker the oil film, the higher the base viscosity of the oil, and the worse the fluidity.

The smaller the value, the lower the shear resistance, the thinner the oil film, the lower the base viscosity and the better the flowability.

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The label of engine oil: The viscosity of lubricating oil is mostly marked by SAE and other grades, SAE is the abbreviation of the English "Society of Automotive Engineers". 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.

SAE) applicable ambient temperature (°C).

5W resistant to external low temperature -30°C

10W resistant to external low temperature -25°C

15W resistant to external low temperature -20°C

20W resistant to external low temperature -15°C

30. Resistant to external high temperature 30°C

40. Resistant to external high temperature 40°C

50. Resistant to external high temperature 50°C

There are two kinds of engine oil grades, which are divided into SAE marking and API labeling, "5W-30" is SAE labeling, and "SN" and "SL" are API labeling.

The label behind SAE indicates the viscosity value of the oil, such as: SAE5W-30, where "W" represents winter, and the number in front of "W" represents the flow viscosity at low temperature. The number after the "w" is the viscosity of the oil at 100, the higher the number, the higher the viscosity.

The specific classification of automobile engine oil is 4 kinds of summer oil, 6 kinds of winter oil, and 16 kinds of winter and summer general oil. Among them, the summer oil grades are respectively, the larger the number, the greater the viscosity, and the higher the applicable maximum temperature; The winter oil grades are:

0W, 5W, 10W, 15W, 20W, 25W, the symbol W represents the abbreviation of 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; Then there's the winter and summer all-purpose oils.

The meaning of motor oil designation is grading and viscosity specifications. The oil designation usually indicates viscosity and quality. The specific interpretation is as follows:

The viscosity of lubricating oil is mostly marked by SAE and other grades, and SAE is the abbreviation of the English "Society of Automotive Engineers". 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 that can be used, and the better the protection ability of the engine during cold start; The number after the "W" 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.

Precautions for choosing car 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, because multi-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, premature blackening and oil pressure may be smaller than that of ordinary oil during use, which is normal.

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 high temperature season or under the condition of severe engine wear, the selection of high viscosity oil to change the wheel is conducive to the formation of oil film and reduce engine wear.

What is the difference between car oil labeling?

What does motorcycle engine oil grade SF15W-40 mean:

A: SF refers to the American Society of Petroleum Engineers regulations.

What does the car oil label mean:

Q: For example, what is Sanhe Engine Oil SN Full Synthetic Engine Oil SAE5W 40.

SN is the level. At present, it is a higher level in China;

Fully synthetic. It refers to the difference between the composition of the engine oil and the general mineral engine oil, which is a contract oil with high-grade chemical substances.

sae5w-40.Refers to the viscosity adaptability of engine oil, which is more suitable for most parts of the country in summer and autumn.

Purity, for example, 90 is not as pure as 92 oil.

SN is the highest oil grade of API (American Petroleum Engineering Institute), SAE 5W-40 is a multi-grade oil, SAE0W, SAE15W, SAE20W, the W after SAE indicates winter, while the number also indicates viscosity, the lower the number means less viscosity. Since this type of oil is used for low temperatures in winter and has a low viscosity, the lower the temperature, the lower the number of the oil. The lower the viscosity of the oil, the greater the starting speed of the engine; At the same time, the lower the pour point of the oil, the easier it is for the oil to be pumped, which can reach the lubrication part more quickly, and shorten the time for the engine to withstand dry friction.

The second type is the all-weather type of multi-grade viscosity: the oil marks are: SAE5W 30, SAE15W 40, SAE20W 50.

The first half of the bars indicates the winter low-temperature viscosity properties that the marking oil complies with, and the second half of the bars indicates the summer high-temperature viscosity properties. The lower the number before w, the better the fluidity of the lubricant at low temperatures and the easier it is to start the car. The larger the number after W, the better the viscosity of the oil in the high temperature environment, the stronger the oil film is generated, and this oil can basically be used for all seasons.