What does 5w 40 engine oil mean?

5w represents the low-temperature fluidity of the oil, the lower the value, the better the flow, 40 indicates the viscosity of the oil after the normal operation of the engine, and the higher the value, the higher the viscosity.

W indicates the temperature range of the oil, from 0w, 5w, 10w, 15w, 20w, 25w, etc., the smaller the number, the better its low temperature fluidity, and the more it can work under low temperature conditions.

40 indicates the viscosity of the oil at 100, the grade has SAE, the higher the number, the higher the viscosity, 5W50 is commonly known as multi-grade oil. It means that the viscosity of this oil meets the requirements of 5w at low temperature, and the viscosity of 100 meets the requirements of No. 40.

5W-40 is a very common type of motor oil.

The details are as follows.

1."W" stands for winter.

2.The lower the number, the more resistant the oil will be, and it will be easier to start the engine when the temperature is too low.

3."40" stands for the kinematic viscosity standard at 100 degrees Celsius (to), and the higher the number, the better the protection at high temperatures.

Adapted to the model of engine oil 5W-40.

German cars are usually turbocharged engines, and the clearance is relatively large, so you have to choose 5w-40 (high viscosity) oil, and most European cars also use 40 viscosity oil.

For cars that are more than 7 years old, the engine is prone to aging and the degree of wear is more serious, so it is necessary to use 5w-40 engine oil with high viscosity.

Cars that often go at high speeds, the heat and wear of the engine are more serious, it is recommended to use 5w-40 engine oil.

It is better to use 40 will be more suitable, but the quality of 5w40 is not as good as 0w40, or 0w40 is more suitable, I used the original 5w40 before, enough, but there is no special experience, now it is replaced with 0w40 g t magic red engine oil, four types of pao base oil high quality, long-term durability. There is no problem with the change of 15000 public management, and the addition of esters, the power is sufficient, and the driving experience is much better than the previous engine oil.

German cars use 40 viscosity, high engine working temperature, high temperature resistance of the oil, generally use 40, the wrong oil will cause great damage to the engine. Volkswagen has been using G T Magic Red 0W40 engine oil, the base oil of the four types of PAO has good high temperature resistance and recession resistance, and at the same time, there is the addition of liquid molybdenum, strong anti-wear protection, and the driving experience is much better than the previous engine oil.

The quality of 0w engine oil is much better than that of 5w engine oil, Magotan used 5w40 engine oil in winter before, not to mention the slow hot car, and sometimes it takes several times to start the car, which is not small to the engine. Now I have changed to 0W40 G T Magic Red Engine Oil, the base oil of Class IV PAO has good fluidity, the start speed is fast, and the car starts faster when I go out in the morning. There is also the addition of liquid molybdenum, which has good anti-wear performance, which can better protect the engine.

"W" means winter (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, such as 5W represents the external low temperature resistance -30 °C, and the 20W low temperature resistance is -15 °, and the number behind the 20W low temperature resistance represents the kinematic viscosity of the oil at 100, the higher the value, the higher the viscosity.

The value of 5W before the short bar in 5W-40 represents the low temperature performance of the engine oil Cold start performance, generally 0W low temperature protection performance is the best, like the imported Jinmei GT lubricating oil is 0W model.

The value of 40 after the stub bar represents the high temperature performance of the oil. The number 40 after the short bar corresponds not to the ambient temperature, but to 100 kinematic viscosity and 150 high temperature and high shear viscosity.

"5w-40", "w" stands for "winter" which means used in winter, and the 5 in front of "w" represents the viscosity at low temperatures. "40" refers to the viscosity at 100, and the higher the number, the higher the viscosity and the stronger the ability to withstand high temperatures.

The letter w stands for low temperature, winter; The number 5 in front of the letter W represents the low temperature fluidity, the smaller the number, the better the low temperature fluidity of the engine oil; The number 40 after the letter W represents the high temperature viscosity, the higher the number, the better the high temperature viscosity of the engine oil.

According to the age of the car to determine the viscosity of the oil, if the age of the car has been more than 7 years, the engine aging is inevitable, the degree of wear must be more serious than before, then in order to better protect the engine, you have to use 5w40 oil with higher viscosity.

The wrong way to use motor oil.

1. Add more oil if you can.

The amount of oil should be controlled between the upper and lower scale marks of the dipstick. Because too much lubricating oil will enter the combustion chamber from the gap between the cylinder and the piston, and burn to form carbon deposits.

2. Additives are of great use.

A truly high-quality lubricant is a finished product with a variety of engine protection functions, a formula that already contains a variety of additives, including anti-wear agents, and the most important thing about the balance of the lubricant is to ensure that the performance is fully realized. Self-addition may cause a decrease in the overall performance of the oil.

The meaning of 5w40 engine oil, that is, the vehicle can be applied to 5w40 engine oil in an environment of -35 40.

The letter W represents low temperature, winter, the number 5 in front of the letter W represents low temperature fluidity, the smaller the number, the better the low temperature fluidity of the oil, the number 40 after the letter W represents the high temperature viscosity, the larger the number, the better the high temperature viscosity of the engine oil.

According to the age of the car to determine the viscosity of the oil, if the age of the car has been more than 7 years, the engine aging is inevitable, the degree of wear must be more serious than before, then in order to better protect the engine, you have to use 5w40 oil with higher viscosity.

Precautions for the use of engine oil.

It should be a habit to check the condition of the vehicle in a timely manner. Shanghai Volkswagen's maintenance cycle is based on the normal driving conditions of the car. For vehicles that are used in harsh conditions, some work must be carried out between service intervals.

Taxi relative to ordinary vehicles, idle time for a long time, frequent stop start, low-speed operation, is more likely to cause the increase of oil consumption, so more attention should be paid to timely inspection, add oil.

The quality of 5W is definitely not as good as 0W, it is normal for the start to be not smooth, I have used it before, and now it is replaced with G T Magic Red Engine Oil 0W40 Mark, the base oil of the four types of PAO has good fluidity, fast start, and the addition of esters, the power is sufficient, and the driving experience is much better than the previous engine oil.

The quality of 0w oil is much higher than that of 5w oil. The 0w40 engine oil that Magotan is using now feels very good to use the car. I bought all the imported G T Magic Red and went back to the auto repair shop to change it, and the labor cost was less than 100 yuan.

The PAO oil power is very strong, you can drive more than 10,000 kilometers, I do a maintenance of 15,000 kilometers, compared with the previous maintenance is much longer, maintenance is cost-effective.

My Volkswagen used to be the first to buy 5W-40 engine oil, and then because the car was too noisy, it was replaced by G T Magic Red 0W40 engine oil, and the anti-wear effect of liquid molybdenum was really good, and the noise was obviously reduced. The quality of 0w oil is better than that of 5w oil, and the PAO high-quality oil is very powerful.

The number of the oil:

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". For example: SAE15W-40, SAE5W-40, "W" means winter (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

"W" means winter (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, such as 5W represents the external low temperature resistance -30 °C, and the 20W low temperature resistance is -15 °, and the number behind the 20W low temperature resistance represents the kinematic viscosity of the oil at 100, the higher the value, the higher the viscosity.

The lower the value, the better the low-temperature fluidity, the better the lubrication protection of the engine at low temperature, and 40 is the viscosity at high temperature. If it's the Northeast, you must use 0w, like yourself because it's an old car, you use GT magic red 0w40, if you don't run a new car for long, generally 0w30 can.

5 represents minus 30°. W is for winter. 40 represents viscosity, and viscosity has . Northeast can be used, all seasons engine oil. It's best to follow your vehicle's instructions.

5w-40 engine oil means that the low temperature fluidity of the engine oil is 5w, and 40 represents the viscosity of the engine oil, which is a very common type of engine oil.

W stands for winter means winter use, the 5 in front of w represents the viscosity at low temperature, the smaller the number, the stronger the fluidity and mobility at low temperature, and the stronger the ability to withstand cold. "40" refers to the viscosity at 100, and the higher the number, the higher the viscosity and the stronger the ability to withstand high temperatures.

Engine oils, engine oils or engine lubricants are a class of substances that are enhanced with additives in base oils, mainly containing anti-wear additives and cleaning agents, dispersants, and multi-grade oil viscosity index improvers. The main function of motor oil is to reduce friction and wear on moving parts and to remove sludge (one of the functions of dispersants) and paint (cleaners) from the engine.

Points to note about the viscosity of engine oil

The viscosity is too high, the oil is thicker, the oil is not transported to the parts in a short time, so it will increase the wear and tear during starting, the low temperature start will become difficult, the cleaning and washing effect and the cooling and heat dissipation effect will become worse, the power loss will lead to an increase in fuel consumption, the viscosity is too low, the oil is thinner, and it is not very reputable or effective to be adsorbed between the parts, so the lubrication, anti-wear and sealing effects can not be well played, and the oil consumption is also increased.

Logically speaking, as long as the oil does not deteriorate and the quality is good enough, the oil film will always exist, giving full play to the performance of the oil and protecting the car. However, if the oil contains more water, the lubricity of the oil will deteriorate, the viscosity will decrease, the anti-friction effect of the oil film will become worse, the oil deterioration is inevitable, and it may also lead to more serious accidents, such as engine shaft and tile burning.

The above content reference: Baiqing Jane Wuke-5W-40 engine oil.