Which is better, 5w30 or 5w40

Generally speaking, 5w40 is better. In general, 5w40 oil** is also a little more expensive. The number plus sign in front represents the oil sign in winter, the smaller the number before the w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature, and the later the number represents the summer oil card, the larger the number, the greater its viscosity, and the higher the applicable maximum temperature.

The difference between engine oil 5w30 and 5w40

1. If the car is in good condition, the viscosity of the oil must refer to the recommended viscosity in the "Car Maintenance Manual", because the technical requirements of the engine designed by each automobile manufacturer are different, and the requirements for the viscosity of the oil are also different.

The W-40 has better oil stability than the 5W-30 in the particularly high engine temperatures.

3. For cars in old condition, the engine noise of using 5w-30 oil is slightly louder than that of 5w-40 oil.

4. Engine oil of the same quality level: 5W-30 has better fluidity than 5W-40, which can reduce fuel consumption (fuel) and dissipate heat faster to the engine, and the fluidity of low-viscosity oil is better than that of high-viscosity oil.

5. For engines that strictly require the use of 5W-40, if 5W-30 is used, there may be a situation where the oil consumption is greater than normal.

To put it simply, 5w40 is thicker than 5w30 oil, the longer the car is used, the higher the number of kilometers, then the oil you choose has to choose the oil with the larger number behind w, because the parts in the engine are also worn out, and the gap becomes larger If you use dilute oil, it will burn the oil, depending on the engine model. It doesn't say which one is good and which one is bad, depending on which one your car fits into.

Engine oil 5w30 is better. The main difference between 5w30 and 5w40 is viscosity, 5w30 viscosity is low, there are more traffic jams in Beijing, 30 viscosity oil will start faster than 40 viscosity, the power cover orange response is more obvious, if it is winter, the cold start will be better than 40.

Of course, it is not 40 bad, it is more suitable for 30 in the case of traffic jams in Beijing, if it is often high-speed and intense driving a lot or 40 viscosity is more secure, because the viscosity is higher, the engine is better at high speed and high temperature.

In addition, it still depends on what kind of car it is, if it is a European car and the displacement is above the displacement, do not consider the 5w30 oil, of course, the high temperature shear value is above, the 5w30 oil with a kinematic viscosity of 12 or more is barely OK, but it is still recommended that 5w40 is safer.

Oil designation

The oil label consists of two parts: grading and viscosity specification. 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 "American Association of Automotive Engineering Engineers".

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.

The label after the classification of the engine oil indicates its viscosity specifications, for example, in "15W W-40", "W" means (winter), the more obvious 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, 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. The kinematic viscosity standard at 100 degrees Celsius in the 40 generation leaseback table is between to, and it is definitely not something that can be used below 40 as some people say.

5w40。Generally speaking, 5w40 is better, and in general, 5w40 oil ** is also a little more expensive, the number plus the sign in front of the symbol represents the winter with the oil sign w represents winter, the smaller the number before w, the smaller the low temperature viscosity, the better the low temperature fluidity, the lower the minimum temperature applicable, the lower the number represents the summer oil card, the larger the number, the greater the viscosity, the higher the applicable maximum temperature.

Precautions for the use of engine oil.

It should be noted that when choosing engine oil, it is necessary to select the engine oil grade specified in the automobile instruction manual, if there is no same level of engine oil, you can use a higher level of engine oil, but you must not replace it with a lower grade.

The main basis for the selection of the viscosity grade of the oil is the ambient temperature. Under normal circumstances, in April and September, most parts of the country can choose No. 20 and No. 40 summer engine oil.

The vast majority of car owners will use engine oil during car maintenance, 5w-30 and 5w-40, the difference of 10 indices of the two car oil will always make it difficult for car owners to choose: which oil is of better quality and more suitable for their car? So how do you know which model to choose for your car?

Clause. First, look at the car series.

American cars, the engine is more precise, the gap between parts is smaller, and the oil of 5w-30 is the most suitable. As for German cars, turbocharging technology is usually used, and the gap will be relatively large, and it will be relatively better to choose 5W-40. Japanese and Korean cars will use more viscous oils, such as:

sae 0w
w
w
w-30；The American system recommends using 30 viscosity, such as: SAE 5W-30, and the European system uses 40 viscosity, such as: 0W W-40.

Clause. Second, look at the age of the car.

By referring to the maintenance manual on the car, new cars usually choose oil with slightly lower viscosity, then add 5w-30, and Japanese and Korean cars can use 0w20. As the car ages, slowly choose a slightly more viscous engine oil, because the wear of the older car engine will be more serious, choose a relatively higher viscosity of the Riseau engine oil 5W-40.

Clause. 3. Look at the road conditions.

At the same time, the road conditions will also greatly affect the life of the oil, poor road conditions in the area, should be quite short the oil change cycle, and in the urban area due to more vehicles, often stop and go, it is recommended that the viscosity is a little lower, SN5W-30 will be very suitable, if you often run long distances and the like, it is recommended to SN5W-40.

Clause. Fourth, look at the season.

The main differences between 5w30 and 5w40 are:

The 5W-30 flows relatively well and is more capable of reducing fuel consumption problems, allowing the engine to dissipate heat faster and better. At the same time, for some older cars, the use of 5W-30 will cause the engine noise to be slightly larger, and some strictly require the use of 5W-40 engines and choose to use 5W-30 will cause greater fuel consumption than normal. At high temperatures, 5W-40 will have better oil stability.

Answer kiss, viscosity difference, 5W is low temperature minus 30 degrees can be used, the back is viscosity, a little better 0W, I Buick Yinglang, has been using German GT engine oil 0W30, higher quality than the general fully synthetic engine oil 5W, more comfortable to open.

And it depends on where you drive, in fact, in the central region, there is not much difference between 30 and 40, 30 can be a little thinner and save some fuel, but the engine sound can be a little louder than 40.

Hope it helps! Have a great day!

The difference between 30 and 40 engine oil is that the viscosity is different, Kaiyue is to use 30 viscosity, no need to change to 40, not the higher the viscosity, the better to choose the right car for yourself, it is best to use better quality 0w30 engine oil, I read Lang maintenance is G T magic red 0w30 fully synthetic engine oil, Shanghai here is a traffic jam during the rush hour, with g t magic red starting response is much better than the original 5w30, 15000 kilometers to replace once is also longer than the original 5000 kilometers, And the oil is well lubricated, which can help extend the life of the engine.

The main difference between oil 40 and 30 is viscosity. To really improve the performance of the engine, it is necessary to change to high-end fully synthetic engine oil. The engine performance of my old car is OK, after changing the oil, the throttle of the car is sensitive, and the basic fuel is gone, and the power is sufficient and stable.

At that time, I didn't find high-end engine oil in 4S shops or auto repair shops, and I was worried about buying fakes, so I bought imported ones myself. The brand is G T Magic Red, four types of PAO, the oil is relatively pure, and it is the best engine oil I have ever bought.

The replacement cycle is mainly related to the quality of the oil, and if you want to have more lasting power, then change to a durable oil. My car went to change to G T Magic Red 0w30. The four types of PAO base oil are different, the power is abundant and stable after changing, the throttle is available as you step on, the power is not attenuated after running 10,000 kilometers, and you can change it for 15,000 kilometers.

The difference between 30 and 40 is only the difference in the use temperature, 40 is more resistant to high temperatures, Jiangsu, Zhejiang and Anhui, 30 and 40 are OK, or you are 30 in winter and 40 in summer

Just these two models, definitely 5w40, this model is a little better, the quality is better, he is.

In Anhui and Zhejiang, both oils can be used, it doesn't matter.

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.

It depends. If it's an older car, 5w40 is better because it has a better viscosity than 5w30. If it is a new car or a naturally aspirated engine, 5w30 is better, because it can effectively reduce fuel consumption, make the engine faster and dissipate heat better.

If you drive long distances, 5w40 is better.

Engine oil

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.

The main oil identification is: 0w, 5w, 10w, 15w, 20w, which means that it can be used above -35 °C, 5 means that it can be used above -30 °C, and so on, and 25 means that it can be used above -10 °C.

The number after w indicates the kinematic viscosity of the engine oil at 100°C, the higher the number, the greater the viscosity, the better the guarantee and more stability, and the less likely it will be thinned at high temperatures.

To put it simply, 5w40 is thicker than 5w30 oil, the longer the car is used, the higher the number of kilometers, then the oil you choose has to choose the oil with the larger number behind w, because the parts in the engine are also worn out, and the gap becomes larger If you use dilute oil, it will burn the oil, depending on the engine model. It doesn't say which one is good and which one is bad, depending on which one your car fits into.

There is no good or bad difference between the two types of engine oil of 5w30 and 5w40, but it is not suitable for the engine of the vehicle, and the one suitable for the vehicle is the best.

The most obvious difference between 5w30 and 5w40 oil is the difference in viscosity, the value after the letter w means the high temperature performance of the oil, but the higher the value, the better. The higher the value, the greater the viscosity of the oil at high temperatures, the viscosity of 5w40 oil at high temperatures will be better, and the viscosity of 5w30 at high temperatures will be worse. If the viscosity is large, the fluidity will be poor, so the fluidity of 5w40 engine oil at high temperature is relatively poor.

In winter, it is best to fill the vehicle with 5w30 engine oil, but this type of engine oil is not suitable for all models, and the vehicle oil needs to be filled according to the manufacturer's recommendation.

It is best not to mix engine oils, especially those of different brands and grades. If the engine oil is mixed, the performance of the engine oil will be changed to a certain extent, and the changed engine oil can not meet the requirements of the engine well. If the oil is less than the minimum tick line, you need to replenish the oil in time, and when filling the oil, you need to empty the remaining oil in the engine, so that the debris in the oil can be well removed.

The number on the oil model is not always better, and the oil can only be used in the right working environment. If the vehicle is driving in the southern region, we can choose the engine oil with a larger value, this value is the value before W, because the minimum temperature in the southern region is not very low, so we can choose the oil with low temperature fluidity is not so good.

Depending on the use environment, the priority of the two will be different. This is because both oils have their own characteristics and can perform differently under different environmental conditions.

There are two main differences between 5w30 oil and 5w40 oil:

1. The viscosity of the two is different, and the number after the oil model W represents the viscosity of the oil. The higher the viscosity of the oil, the better its stability in the high temperature environment, so when the 5w40 oil works in the high temperature environment, it is a little better than the 5w30 oil;

2. The liquidity of the two is different. 5w30 oil is more fluid than 5w40 oil because it is not as viscous and can take away the heat from the engine faster while working. Therefore, when the vehicle is moving, the fuel consumption of a vehicle using 5w30 engine oil is a little lower than that of a vehicle using 5w40 oil.

Because the viscosity of 5w30 engine oil is not so high, it is generally used more by Cadillac, Chevrolet and other American cars, because the parts of these cars are relatively close to each other, so they need more fluid engine oil. The 5w40 engine oil is generally used more by German cars such as Mercedes-Benz and BMW. Because most German cars are turbocharged, the gap between the parts will be a little larger, so a higher viscosity oil will be chosen.