Is it better to choose an oil with a higher viscosity?

Hello! Generally speaking, heavy-duty or low-speed machinery uses high-viscosity oil (such as marine high-power diesel engines), while high-speed or light-duty machinery uses low-viscosity oil (such as high-speed motors), and the higher the viscosity, the faster the volatilization, which is also a factor that must be considered. Hope mine is helpful to you, hopefully!

Hello, this is a little humble opinion of the individual: low viscosity, good fluidity of lubricating oil, low running resistance. High viscosity, thick oil film, good lubrication, high running resistance, high speed, light machinery, must use low viscosity (generally high fluidity liquid), such as children's play models, relative to other engines in life, their engine characteristics are, high speed, low torque, you a drop of high viscosity lubricating oil into it, the engine will not rotate directly.

In this case, only low-viscosity, high-flow lubricants can be used.

Low-speed, heavy machinery, must use high viscosity (generally difficult to flow or not flow at all solid), such as the reducer used in engineering, a few seconds to turn a week, but the power provided can easily directly lift several tons of heavy objects, at this time must use large viscosity lubricating oil, in order to ensure the normal thickness of the oil film, to ensure normal lubrication, if you use low viscosity, the oil film is too thin, may not be very different from the use of lubricating oil, like gasoline so high fluidity lubricating oil poured in, It is estimated that after a few turns, the gears inside will be worn off.

Therefore, this viscosity is suitable for good, not high nor low good, but depends on what model is used, according to the model to choose the appropriate viscosity, whether the oil is good or not, mainly the small viscosity change of the oil at high temperature is good. My Magotan is Kunlun lubricated Runsheng SN 0W-40 fully synthetic engine oil, after changing the engine sound becomes lighter, strong power, strong acceleration, fully synthetic with rest assured, I hope you refer to it.

Generally speaking, heavy-duty or low-speed machinery uses high-viscosity oil (such as marine high-power diesel engines), while high-speed or light-duty machinery uses low-viscosity oil (such as high-speed motors), and the higher the viscosity, the faster the volatilization, which is also a factor that must be considered. ”

There is no such question as high or low viscosity, because they are selected according to the engine's own situation and ambient temperature, and the gap between the internal parts of the engine is small, so the oil with lower viscosity is needed. Conversely, a large gap requires a highly viscous oil.

Hello, this is not, the viscosity of the oil must choose the right one for your car, most of the viscosity is too high for the racing level of the car!

The viscosity of engine oil is not only the basis for the classification of engine oil, but also closely related to the size of the engine power, the amount of wear of moving parts, the degree of sealing of piston rings, the consumption of engine oil and fuel, the smoothness of engine cold start, the temperature of parts and other factors. In short, the best car for your own car, my car has been using Kunlun lubricated Runqiang SN 5W-30 fully synthetic engine oil, coordinates Zhengzhou, no problem to run 11,000 kilometers once, I hope it can help you.

Oil viscosity grading.

SAE uses a viscosity classification system that classifies motor oils into high-temperature types for summer, low-temperature types for winter, and all-weather types for winter and summer. There are 6 kinds of winter oils, 4 kinds of summer oils, and 16 kinds of winter and summer general oils.

1.Winter oil.

0w, 5w, 10w, 15w, 20w, 25w, the symbol "w" represents winter, the smaller the number in front of "w", the smaller its low temperature viscosity, the better the low temperature fluidity, and the lower the applicable minimum temperature.

The Society of Automotive Engineers (SAE) divides the viscosity of motor oil into kinematic viscosity and dynamic viscosity; The unit of kinematic viscosity is cubic meters and seconds, which is the unit of flow under the action of gravity, which refers to the time it takes for a certain amount of liquid to completely flow out of a fixed volume.

The unit of dynamic viscosity is millipascal seconds, which is the unit of force and represents the resistance, and the greater the dynamic viscosity, the greater the resistance to the engine. Both kinematic viscosity and dynamic viscosity are greatly affected by temperature; The lower the temperature, the greater the kinematic viscosity and dynamic viscosity; Conversely, the higher the temperature, the lower the kinematic and dynamic viscosity.

Start the engine in the cold car state, you will find that the engine speed is very high, this is because the movement viscosity of the oil is too large, the flow is too small, so the engine must increase the speed to drive the oil pump to rotate quickly to ensure the reasonable flow of the oil, and wait until the oil temperature rises and the oil viscosity decreases, and the idle speed of the engine can be normal.

The viscosity of the engine oil is not getting higher and higher, and the engine of the car needs to use the right viscosity oil. When choosing an oil, be sure to read the oil model specified on the manual. If the oil viscosity is too high, it will affect the power output and fuel economy of the engine.

Everyone must choose the right viscosity oil for their car.

Engine oil is something that every car owner comes into contact with when using a car. If there is no oil in the engine, the engine of the car will not function properly.

Engine oil not only plays the role of lubrication in the automobile engine, but also plays the role of cleaning, sealing, buffering, rust prevention and heat dissipation.

When the engine is running, the oil will form an oil film on the surface of each component in the engine, which can prevent friction caused by direct contact between the parts in the engine.

If the parts in the engine are in direct contact and cause friction, it will increase the wear and tear of the engine, and a large amount of heat will be generated in the engine instantaneously.

The performance of the engine oil will be reduced after a long period of use, so it is necessary to change the oil regularly.

If you don't change the oil for a long time, it will aggravate the wear of the engine.

Replace the oil filter element with each oil change.

The oil filter element is used to filter the oil. Without an oil filter, the oil will get dirty after a period of use.

When buying oil filters and oil, be sure to buy them from regular channels.

Millions of car purchase subsidies.

The viscosity of the oil is not always better

The viscosity of engine oil is not only the basis for the classification of engine oil, but also closely related to the size of the engine power, the amount of wear of moving parts, the degree of sealing of the piston ring, the consumption of engine oil and fuel, the smoothness of the engine cold start, the temperature of the parts and other factors.

In summer, it is advisable to use lubricating oil with high viscosity, such as 15W W W-50, etc.

In winter, it is advisable to use lubricating oil with low viscosity, such as 5W W-30 or 10W W-40.

Because the viscosity of the lubricating oil changes with the increase of temperature, that is, the viscosity of the lubricating oil decreases when heated, the oxidation resistance becomes poor, it is easy to deteriorate, and even causes failures such as burning tiles and holding shafts. Therefore, the crankcase and gearbox should be replaced with a more viscous summer lubricating oil, and the amount and quality of the lubricating oil should be checked frequently, and replaced in time.

The viscosity of engine oil is too large, and it will have the following shortcomings.

1. It is difficult to start the engine at low temperature.

The oil viscosity is too large, the oil is too slow when the engine starts at low temperature, although the oil pressure is high, but the oil throughput is not much, mainly because of the high viscosity and poor pumping performance of the oil, at this time it is most likely to appear temporary dry friction or semi-fluid friction, which is the main reason for engine friction. Tests have proved that when the engine is started, the torque required to overcome the frictional resistance required for the crankshaft to rotate is large, so the speed is low and it is not easy to catch fire.

2. Large power loss.

The viscosity of the oil is large, and the friction resistance of the friction surface of the parts increases, so that not only the wear of the parts increases, but also the friction loss power also increases, on the other hand, the oil stirring resistance of the crankshaft also increases, so that the Lingji loss power inside the engine increases, and the effective power of the engine is reduced. Studies have shown that the viscosity of lubricating oil 100 can be reduced by 1 unit, which can save fuel.

Even the use of lubricating oil with low viscosity can reduce fuel consumption.

3. Poor cooling effect.

The oil has high viscosity, poor fluidity, slow circulation speed, and the speed of taking heat away from the friction surface is slow, and its cooling effect is poor, which is easy to overheat the engine.

4. The cleaning effect is poor, the viscosity of the oil is large, the circulation speed of the oil is slow, and the number of times through the filter is less, and the impurities such as metal grinding chips, carbon particles, and dust that are worn down cannot be taken away from the friction surface in time, and the cleaning effect is poor.

The improvement of wear resistance of medium and high-grade engine lubricants can be solved by adding additives to the lubricating oil. Therefore, the notion that the more viscous the oil, the better, is incorrect.

<> "About the viscosity of motor oil.

The lower the viscosity of the oil, the better the fluidity of the oil, and the smaller the resistance when the engine is running; The higher the viscosity of the oil, the less fluidity it has and the resistance of the engine is relatively high. The viscosity of engine oil is classified according to SAE (Society of Automotive Engineers) standards, which can be divided into 0w w w w w-40··· The smaller the value, the better the low temperature fluidity of the oil, and the better the protection of the engine when the vehicle starts cold; The number after the "w" represents the index of the engine oil at 100, the higher the number, the higher the viscosity, the better the high temperature shear resistance, the oil film is not easy to break, and the better the protection of the engine.

The vehicle cannot change the high-viscosity oil at will.

Vehicle maintenance first of all, according to the vehicle maintenance manual to choose the oil model and viscosity, can not be changed at will, let alone because of personal preference to add high viscosity oil at will.

For example, if your car stipulates the use of 0w-20 engine oil, if you directly add 5w-40 engine oil, due to the poor low temperature fluidity of the engine oil used, the oil can not be pumped to the required lubrication part in time when the vehicle is cold started, which is easy to cause insufficient lubrication, dry friction of parts, and serious wear; In addition, due to the thick oil film of high-viscosity oil, the engine running resistance increases, and the effective power of the engine decreases, which will lead to insufficient power and increased fuel consumption; The viscosity of the oil is too high, the ability to cool and cool is weakened, and the heat generated during the operation of the engine is not easy to be taken away, which will also lead to the high temperature of the engine and the deformation of some parts by heating.

When can I use a higher viscosity oil?

Although the vehicle maintenance manual stipulates the viscosity of the oil used in vehicle maintenance, many vehicles can be replaced with higher viscosity oil according to different car habits and the increase in mileage

1.Older cars with longer mileage can be replaced with higher viscosity oil. As the vehicle's mileage increases, the wear and tear of engine components is severe, the gaps will increase, and the vehicle needs to be replaced with a higher viscosity oil to increase the seal.

2.The engine burns engine oil, and the vehicle can change the high-viscosity engine oil appropriately. Burning engine oil is the phenomenon of abnormal excessive consumption of engine oil, which is mainly manifested in the fact that the engine oil enters the combustion chamber through the gap in the piston ring or valve oil seal, and is mixed with the fuel and burned.

At this time, replace the higher viscosity oil next to the collapse and collapse, because the oil film is thicker, it is not easy to penetrate into the combustion chamber through the gap, thereby reducing the phenomenon of burning oil.

The viscosity of motor oil is not always better. If the viscosity of the oil is too high, it will lead to greater running resistance in the engine, which will lead to a decrease in engine power and an increase in fuel consumption. If the viscosity of the oil is too low, the oil will not be able to form a stable oil film, and disturbing will increase the wear of the engine.

Engine oil, which is the engine lubricating oil, can lubricate and reduce wear, assist cooling and cooling, seal leakage, rust and corrosion, shock absorption and cushioning for the engine. Usually, the viscosity of the oil bottle is generally xx(w)-xx structure, in which the "w" is the abbreviation of the English winter "winter", if there is a "w" on behalf of "winter applicable". The smaller the value before "w", the better the low temperature fluidity, and the lower the applicable minimum temperature, that is, the more cold resistant; The larger the value of the latter parameters, the higher the temperature that can be withstanded, and the more suitable it is for use under high temperature conditions.

If according to the region, car owners in Beijing can choose SAE5W-30, the use temperature is from -30 to 35, which basically meets the requirements of the year-round car, and there is no need to change the oil type in winter and summer; Owners of ruined vehicles in northern areas such as Heilongjiang and Inner Mongolia can choose SAE0W-30, where the weather is very cold in winter; Car owners in the south of Hainan in Guangdong can choose SAE10 15W-30 40, where the temperature will not be too low throughout the year.

Within the scope of application, the lower the viscosity of the oil, the more labor-saving the engine, not only the more fuel-efficient, but also the smoother the car drives. In recent years, more and more automobile manufacturers recommend the use of low-viscosity engine oil, such as Toyota, which generally recommends the use of 0w-20 engine oil. However, it should be noted that the lower the viscosity of the oil, the thinner the oil film and the better the fluidity, but under the high temperature and pressure, the less protection.

Once too low viscosity oil is used, it will lead to a lack of power and increased engine wear. In short, the higher the viscosity of the engine oil, the better, and it is most appropriate to use the oil label recommended by the car maintenance manual.

Photo by Li Yuanli) @2019