Is car oil 5w 40 or 5w 30?

5W-30 and 5W-40 are two different oil viscosity grades, the viscosity of these two oil is not better than the other, in the case of using the same grade of base oil, 5W-30 and 5W-40 are the same in quality, but the parameter values of the oil are different.

The first 5W represents the low temperature fluidity of the oil, and the smaller the number in front of the W, the better the low temperature fluidity. 5W means that this oil can cope with temperatures above -30 degrees. The latter 30 and 40 represent the high temperature kinematic viscosity, the kinematic viscosity of 30 oil is between 10-12, and the kinematic viscosity of 40 is between 13-16, that is to say, 40 oil is more viscous than 30 oil.

To be honest, it's pretty much the same, and it doesn't make much difference when you use it.

Professionally, to put it bluntly, it is a little thinner in 30, and the car feels strong and fuel-efficient, provided that the viscosity is sacrificed to reduce the protection of the engine. The 40 is viscous to use, and it feels like the car is not as strong as it used to be Fuel-efficient provided that the viscosity is high, it can better protect the engine.

But the difference between these two models, one brand, you can't usually feel it, unless it's a particularly harsh environment.

If you use a thinner one, for example, 20 10, then the car is more powerful, but it is basically equivalent to the engine without oil lubrication, to have strength to penetrate, but the lack is to sacrifice the engine, so don't be entangled in which model to use, fuel cost, strength is not all have their own advantages and disadvantages, but these two models are basically not much different.

It depends on what kind of car you are. Use whatever engine oil is said in the vehicle manual.

Your current car is no longer new, and changing to 5w-30 will increase oil consumption, so you need to check the oil level more frequently.

What brand according to the requirements of each brand manufacturer, to the designated maintenance station.

The requirements of each brand manufacturer are different, and each brand has its own brand of oil for maintenance.

So don't listen to others, or follow the requirements is the best for the car.

How to choose the right oil 5W-30 and 5W-40?

It is likely that when the vehicle is started coldly in the morning, it will not be able to start at all, because the fluidity of the oil at this time is too low and the viscosity is too large, so the engine cannot overcome the resistance of the oil and cannot start, so the number before W is more related to the ambient temperature! The oil of 40 has higher viscosity, better high temperature protection, thicker oil film, better shear resistance, but poor fluidity, which is well understood, high viscosity and poor natural fluidity, the same is 5w, and the low temperature starting performance is the same The lowest starting temperature is minus 30 degrees.

<> because it is more complex and precise, the requirements for engine oil are the highest, so it is necessary to choose a fully synthetic engine oil. For naturally aspirated engines, semi-synthetic engine oil can be used for a smaller displacement, and of course, it is best if you choose a fully synthetic one. That is, the low temperature fluidity of this engine oil, the smaller the number in front of w, the better the low temperature fluidity, with high fluidity, the smoother we start the engine in winter, for example, 0w can cope with the temperature of about -35 degrees, and 5w can only cope with the low temperature of about -30 degrees.

The front 5W is the viscosity grade of low temperature, W is the first letter of English winter, you can see our commonly used engine oil from 0W to 25W, we only need to remember that the number in front of W, the smaller it means that the lower the low temperature performance of this oil, the larger the coefficient of the oil, so that the engine parts can be fully lubricated. However, the viscosity coefficient of the engine oil is large, which means that the fluidity of the oil becomes poor, and the engine needs to overcome the large oil resistance when working, which directly leads to the increase of engine fuel consumption.

5 means to adapt to the temperature within 30. And 0 means a 35, 10 means a 25, w after 20, 30, 40 means the viscosity grade, the larger the number, the higher the viscosity. Usually there are 0w20, 30, 40, 5w20, 30, 30, 40.

It will cause the engine noise to be slightly louder, and some engines that strictly require the use of 5W-40 will cause greater fuel consumption than normal if you choose to use 5W-30. At high temperatures, 5W-40 will have better oil stability.

The difference is huge. Because the engine number of different ** is a little different, and the performance is also different. As a result, the experience of the car is also different.

**The difference is still very large, 40** is still relatively expensive, and relatively speaking, the quality is also a lot of changes, so the better quality of the oil ** is relatively higher.

**The above difference is definitely not big, at most it will only cost a few thousand dollars or so, but I recommend buying some engines with better configurations.

Very large, a little difference in performance will cause a change in **, such as a car this daily necessities, ** and all aspects will be very different.

What is the difference between engine oil 5w-30 and 5w-40, it is easy to spend money in vain if you don't understand.

There are many different grades of engine oil, and different labels indicate different oil properties. Take 5W-30 as an example, 5 means that the temperature applicable to the oil is above minus 25 degrees, if it is 10 means above minus 20 degrees, the smaller the value in front of W, the better the low temperature fluidity. In other words, it is more suitable for northern winter, and has good cold start performance.

W means winter, and the applicable temperature range is relatively large, which means that the engine oil can be used in all seasons.

The value after 5w-30 is the viscosity index, which means that the viscosity index of the oil is 30 in the working state of 100 degrees Celsius, the higher the number, the higher the viscosity, the better the protection of the engine at high temperatures. However, depending on the driving situation and the type of vehicle, it should be filled with the appropriate grade of oil.

The main difference between 5W30 and 5W40 is that 5W-30 has relatively better fluidity and is more capable of reducing fuel consumption and making the engine 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.

Secondly, the same quality level of engine oil:

The W-30 flows better than the 5W-40, reduces fuel consumption (fuel) more, and dissipates heat from the engine faster. (Low viscosity oils flow better than high viscosity oils).

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

3. 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 (commonly known as: burning oil).

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

5W-30 flows better than 5W-40, reduces fuel consumption (fuel) more, and dissipates heat faster to the engine. The 5W-40 has better oil stability than the 5W-30 in the particularly high engine conditions. Hope to adopt!

The rules for the marking of motor oil are a set of foreign standards formulated by the American Society of Motor Vehicle Engineers. Take 5w-30 as an example, the letter "w" represents the meaning of winter, that is, the first letter of English winter; The 5 in front of w represents low-temperature fluidity.

You don't care about the front 5w, this is how deep the temperature is below zero. 30 and 40, that is, the higher the number, the greater the stickiness, if your car manufacturer recommends a 30 mark, then your car has a 30 mark after three or four years.

The number after w refers to the kinematic viscosity of the oil at 100, the higher the number, the greater the viscosity of the oil, so the viscosity of 5w-30 oil will be a little lower than that of 5w-40. The details page of the Championship has an icon to explain, and it is clear at a glance.

The main difference between 5W-30 and 5W-40 is that the viscosity is different, if the oil label is not selected properly, it will have a certain impact on the fuel consumption and power of the car, so be sure to check it out. If you don't understand, you can match it with the Championship's oil query system.

We know that the most important thing in a car is the engine of the car, and the quality of the engine also determines the quality of a car. The indispensable thing in the engine is the engine oil, basically every time I go to the 4S shop for maintenance, the staff of the 4S shop will check the oil, and the oil is deteriorated or reduced.

I have read a popular science article about Crown engine oil, different grades of engine oil, different fluidity and protection, the lower the viscosity of the oil, the thinner the oil film and better fluidity. Conversely, the viscosity is high, the oil film is thicker, the fluidity is weakened, and the protection at high temperatures is good.

40 and 30 represent the viscosity at 100 degrees.

The viscosity is different at Celsius.

"w" means winter, and the number after w refers to the viscosity of the oil at 100 degrees Celsius, and the higher the number, the greater the viscosity of the oil. Therefore, the viscosity of 5w-30 oil is not as great as that of 5w-40.

2. The protection performance is different.

The higher the value, the better the protection performance of the oil at high temperature, so the protection performance of 5W-30 oil at high temperature is not as good as that of 5W-40.

Especially in the case of high engine temperatures, the engine noise of 5w-30 is louder than that of 5w-40.

3. The liquidity is different.

Because the viscosity of 5W-30 is smaller than that of 5W-40, the fluidity of 5W-30 is better than that of 5W-40 of the same quality oil, which can reduce fuel consumption.

The difference between 5W-40 engine oil and 5W-30 engine oil is that the viscosity is different, the 5W-40 high temperature viscosity is large, and the fluidity deviation; The 5W-30 high temperature viscosity is small, and the fluidity is better. The value after w refers to the high temperature performance of the oil, not the higher the number, the better the attitude.

The difference between engine oil model 5W-30 and 5W-40: W stands for winter, which means that it is used in winter; The 5 in front of w represents the viscosity at low temperatures; The lower the value, the higher the fluidity and cold resistance at low temperatures. 40 can be used in the summer when the temperature is below 40 degrees, and 30 can be used when the temperature is below 30 degrees.

There are 6 kinds of winter oils, 4 kinds of summer oils, and 16 kinds of winter and summer general oils.

1.The grades of winter oil are 0w, 5w, 10w, 15w, 20w, and 25w. The symbol W stands for winter. The smaller the value before w, the smaller the low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature.

2.The grades of summer oil are respectively. The higher the value, the higher the viscosity and the higher the applicable maximum temperature;

3.The grades of winter and summer general oils are 5w w w w-50.

If the viscosity is too high and the oil is too thick, the oil cannot be delivered to the parts in a short time, which will increase the wear at start-up, make it difficult to start at low temperatures, make the cleaning function and cooling heat dissipation function worse, and increase the power loss and fuel consumption. The viscosity is too low, the oil is too thin, the parts can not be effectively absorbed, the lubrication, anti-wear, and sealing functions can not be played well, and the fuel consumption will also increase. In principle, 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 lubricating performance and viscosity of the oil will deteriorate, the friction reduction effect of the oil film will also deteriorate, and the deterioration of the oil is inevitable, which may also lead to more serious accidents, such as poor old motive shaft holding, tile burning, etc.

Photo by Pacific Automobile Network Q&A).

The turbocharged engine uses 5W-40 oil, while the self-priming engine can choose 5W-30 oil.

5W-40 is a temperature range that represents a good viscosity of the oil. The viscosity of the engine oil will become higher at low temperature, take the peanut oil we usually use, if you fry vegetables in winter, the peanut oil will become a paste at low temperature; The oil becomes more fluid at high temperatures, and the paste-like peanut oil will melt naturally when you put it in a hot pan.

Therefore, 5W-40 oil and 5W-30 oil have the same low temperature properties, but 5W-40 has a higher viscosity in high temperature properties. The body temperature of turbocharged engines is often higher than that of naturally aspirated engines, so turbocharged engines can choose 5w-40 oil, while self-priming engines can choose 5w-30 oil.

The differences between 5W-30 and 5W-40 engine oil are different in kinematic viscosity, different antioxidant properties, and different decontamination properties. The specific differences between the two are as follows: 1. The kinematic viscosity is different

1. Engine oil 5w-30: The kinematic viscosity of engine oil 5w-30 is 30 when it is 100, which is lower than that of engine oil 5w-40. 2. The engine oil is ready to be bright 5W-40:

The kinematic viscosity of oil 5w-40 at 100 is 40 higher than that of oil 5w-30. 2. Different antioxidant properties: 1. Engine oil 5w-30:

The antioxidant activity of engine oil 5w-30 is worse than that of engine oil 5w-40, and the ability to protect the engine is worse when starting. 2. Engine oil 5w-40: The antioxidant performance of engine oil 5w-40 is better than that of engine oil 5w-30, and it has better protection ability for the engine when starting.

3. Different decontamination: 1. Engine oil 5w-30: engine oil 5w-30 has a better effect of inhibiting the formation of carbon deposits, paint film and sludge or removing these deposits than engine oil 5w-40.

2. Engine oil 5W-40: Compared with engine oil 5W-30, the effect of inhibiting the formation of carbon deposits, paint film and sludge or removing these deposits is relatively poor.