What does 5w 30 mean on oil?

The 5W-30 on the oil represents the number of the oil, and each number represents its performance parameters. In the 5w-30 oil, 5 represents the low temperature fluidity of the oil, the lower the number indicates the lower the ambient temperature available for use, and 5 represents the external low temperature resistance -30 °C; And w stands for winter, and the last 30 represents 100 degrees Celsius.

The kinematic viscosity standard is 30.

The number after w is the stability of the oil at high temperature (i.e., the possibility of thinning), the higher the value, the better the stability of the oil at high temperature.

Common sense of motor oil.

Engine oil can be roughly divided into two types, one is mineral engine oil, the other is synthetic engine oil, of which synthetic engine oil can be divided into semi-synthetic engine oil and fully synthetic engine oil, in the final analysis, it is base oil.

Different. In terms of performance, synthetic engine oil is better than mineral engine oil, regardless of whether it is in a low temperature or high temperature environment.

, the former outperformed the latter. As the saying goes, you get what you pay for, so synthetic engine oil is higher than mineral engine oil.

Mineral engine oil is made in ordinary mineral oil.

On the basis of the addition of additives obtained; Semi-synthetic engine oil is obtained by adding synthetic mineral oil and additives on the basis of ordinary mineral oil; Fully synthetic motor oil is obtained by adding additives to synthetic mineral oil.

The above content refers to Phoenix.com - Car Engine Oil"Encyclopedia of knowledge"

5w refers to the minimum low temperature resistance of the engine oil Subtract 35 from this number is the minimum temperature resistance of the engine oil.

30 refers to the viscosity of the oil.

The scientific name of engine oil is engine lubricant. As the name suggests, it is used to lubricate the engine, if the engine is the heart of the car, then the oil is the blood in the heart, which is very critical.

What does motor oil do?

Engine oil plays a pivotal role in the engine, as long as the engine is running, the oil will continue to flow, in this flow, to complete its mission. So what are the main functions of engine oil?

1. Lubricate and reduce wear.

Lubricating oil, the first task is, of course, lubrication. In the operation of the engine, the surface of various metal parts will produce high-speed friction, and the role of oil is to form an oil film between the parts through flow, reduce friction resistance, and reduce wear, thereby prolonging the life of the engine.

2. Cleaning effect.

When the engine oil circulates and flows inside the engine, it can bring out the dirty things such as carbon deposits, oil stains, and oil sludge generated by the engine, and finally settle in the oil pan to prevent the dirt from re-entering the engine, so as to achieve the cleaning effect.

3. Protection.

In addition to protecting the engine through lubrication, engine oil can also play a protective role through its own "oiliness". For example, the oil adheres to the surface of the metal parts for a long time, so that the metal parts are isolated from the air, so that it can play a role in rust and oxidation. In addition, the oil adheres to the gaps between the parts, forming an oil film that makes the parts better sealed and reduces the possibility of leakage.

4. Auxiliary cooling.

The oil is constantly circulating and flowing with the engine in high-speed operation, which can bring out part of the heat in the engine and play a role in auxiliary cooling.

5. Buffering effect.

The oil can bear a part of the shock load transmitted by the bearing, and at the same time, it can also play a certain role in cushioning the mutual impact between the components.

3. The type of engine oil.

Friends who have bought or replaced engine oil must have heard of such terms, mineral engine oil, synthetic engine oil, and so on. That's right, these are different types of motor oils, and at the moment there are mainly two types of mineral oils and synthetic oils.

1. Mineral engine oil.

Mineral engine oil refers to the engine oil made from mineral oil refined from petroleum and then supplemented with additives.

2. Synthetic engine oil.

Synthetic motor oil, divided into two types: fully synthetic and semi-synthetic. Fully synthetic motor oil refers to a base oil that is completely chemically synthesized. Semi-synthetic motor oil is a motor oil made from mineral engine oil based on synthetic motor oil additives.

The main difference between mineral oil and synthetic oil is that synthetic oil is more resistant to high temperatures, viscosity changes, and wear. Synthetic motor oils have a wider range of temperatures, longer service life, and naturally higher. To put it simply, synthetic motor oil has a stronger "adaptability" and "staying power".

Indicates the viscosity of the oil and the suitable temperature 5w 30 indicates the viscosity level, indicating that the suitable temperature is between -30 and 30 degrees Celsius.

If you want to change the engine oil for 10,000 kilometers, then change to a good quality 0w fully synthetic engine oil. What I am using now is the G T magic red of 0w30, four types of PAO, with higher durability, 15,000 kilometers for change, and the power does not decay after running 10,000 kilometers. The brand was looking for a long time, and I didn't dare to go to the auto repair shop for fear of fakes, and I didn't dare to shop online casually.

Take the "15W W-40" as an example:

"W" means 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, such as 5w represents the external low temperature resistance -30 °C, and the 20w low temperature resistance 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. 40 represents 100 degrees Celsius, and the kinematic viscosity standard is between to, which is definitely not what some people say can be used below 40.

w, which means winter. The lower the number, the better the fluidity of the oil at low temperatures, and the lower the applicable minimum temperature5W means that the applicable temperature is -30 or above

The number 30 after the w refers to the viscosity of the oil at 100The higher the number, the higher the viscosity of the oil, the stronger the ability to withstand high temperatures, and the better the high temperature protection performance.

Applicable models of 5w30.

From the perspective of vehicle brand, 5W30 is more suitable for Japanese cars and Korean cars, and the engines of these two series of vehicles are more precise and the clearance is smaller. If you simply look at the viscosity label, 5w30 is more suitable for areas with low temperatures and winter.

In addition to learning to look at the viscosity grade of the oil, it is also necessary to have a general understanding of the shelf life of the oil. Fully synthetic engine oil, about 10,000 kilometers of the car or change once a year; Semi-synthetic engine oil, the car has to be changed once after 7,500 kilometers or seven or eight months; Mineral engine oil, the performance is not so good, the replacement cycle should be shortened accordingly, the car has to be replaced once every 5,000 kilometers or six months.

5w30 is the viscosity specification for the motor oil marking. The number in front of W is 5, the smaller the number, the better the fluidity of the oil at low temperatures, indicating the lower the applicable minimum temperature, and 5W means that the applicable temperature is -30 or more. The number after w is 30, which refers to the viscosity of the oil at 100, the higher the number, the higher the viscosity of the oil, and the stronger the ability to withstand high temperatures.

Methods of oil selection:

It is best to use multi-viscosity lubricating oil when choosing engine oil, lubricating oil (also known as multi-grade lubricating oil) has the nature of light oil at low temperature, and has the nature of heavy oil at high temperature, and in the case of recommending the use of multi-grade oil, a multi-grade oil can replace a variety of single-grade oil.

Although multigrade oils are suitable for extremely cold and warm seasons and heavy-duty engine oils, especially those that do not have difficulty starting in cold weather, a single viscosity lubricant is often recommended to facilitate engine lubrication and extend engine life.

5 is the fluidity of low temperature starting, which means that it can be started at a temperature of -35 degrees, the lower the value, the better the flow, and 30 means that the oil viscosity is higher and thicker after the normal operation of the engine.

Engine oil 5w-30 represents the number of engine oil, where 5w represents the minimum starting temperature of engine oil is -30, the more ** the number in front of w, the better the low temperature fluidity of the engine oil; The 30 represents the stability performance of the oil at high temperatures, and the higher the value, the better the stability performance of the oil at high temperatures.

SAE and API will be seen on the outer packaging of the oil. SAE is the abbreviation of the Society of Automotive Engineers, and API is the abbreviation of the American Petroleum Institute. The designation after the SAE indicates the viscosity value of the oil, while the designation after the API indicates the quality level of the oil.

Meaning of engine oil 5w30: 5w in 5w-30 indicates the performance of oil cold starting. Using an oil with a lower value in front of the engine makes it easier to start the engine in cold weather.

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.

The value behind W-30 is the viscosity index, which means that the viscosity index of the oil is 30 at 100 degrees Celsius, and the higher the number, the higher the viscosity, the better the protection of the engine at high temperatures.

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.

The lower the applicable minimum temperature; Then there is the winter and summer general oil, the grades are: 5w w w-50, the smaller the number representing the winter part, the larger the number representing the summer part, the higher the viscosity, the larger the applicable temperature range.

w, which means winter. The number in front of w is 5, the smaller the number means that the oil viscosity is greater at low temperatures; The number after W is 30, which refers to the viscosity at 100, and the higher the number, the higher the viscosity of the oil. The role of engine oil in the engine can be said to be very large, it can be said that the life of an engine is largely determined by the oil, because the engine only under the lubrication of the engine oil will make the damage to the engine to a minimum, so that the life of the engine increases.

5W30 can be changed to 0W30, 0W marking is better, my Regal is to change GT Magic Red 0W30 engine oil. Class 4 PAO base oil + esters, the engine is very silent after changing, the power is fast, and the driving is very easy.

In the case of choosing the right number, the main thing is to look at the quality of the engine oil, the GT magic red engine oil I use is 0W30 viscosity, the performance is better, especially in the winter cold start fast, the car used to be hot for five or six minutes, now you can go in one or two minutes, and GT is PAO fully synthetic engine oil, good lubrication, and the car is better for the car with good quality oil after a long time.

Engine oil 5W-30 represents the engine and car oil with good low-temperature fluidity.

1.Winter oil grades are: 0w, 5w, 10w, 15w, 20w, 25w, the symbol w represents winter is 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.

2.The higher the number, the greater the viscosity, and the higher the applicable maximum temperature.

Engine oil, that is, engine lubricating oil, English name: engineoil. The density is about to be able to lubricate and reduce friction, assist cooling and cooling, seal leakage, rust and corrosion, shock absorption and cushioning for the engine.

It is known as the "blood" of automobiles. Engine oil is made up of two parts: base oil and additives.

Base oil is the main component of lubricating oil, which determines the basic properties of lubricating oil, and additives can make up for and improve the shortcomings of base oil performance, giving some new properties to Fanzao, which is an important part of lubricating oil.