What are the principles for the selection of automobile engine lubricants?

The first is the quality of the engine oil, that is, the base oil, and then the actual experience, the brand awareness can also be referred to, but all the good engine oil I have used are niche high-end brands, and the GT Magic Red, PAO and ester base oil that I have been using in recent years should be the best among all the fully synthetic engine oils, and it is also the most durable 15,000 kilometers that I use to change once.

The main performance indicators of lubricating oil:

Viscosity, Viscosity Index, Density and Specific Gravity, Pour Point, Flash Point, Demulsibility, Air Release, Ignition Point, Foaming, Oxidation Stability, Neutralization Value, Corrosivity, Rust Resistance, Pour Point Test, Copper Corrosion Test, Flash Point Test, Wear Resistance and Extreme Pressure Test.

Viscosity is the most important single performance index of lubricating oil, it is the main factor in the formation of lubricating film, thus determining the load-bearing capacity of lubricating oil.

Viscosity can be divided into kinematic viscosity, dynamic viscosity, En's viscosity, Rays' viscosity and Say's viscosity; Among them, kinematic viscosity is the most commonly used viscosity representation of lubricating oils.

2. Viscosity index.

Viscosity Index: is an experimental value used to indicate the degree to which an oil changes with temperature. The viscosity of a liquid decreases with increasing temperature, and the higher the viscosity index, the less the oil changes with temperature.

3. Density and specific gravity.

The density of a liquid usually refers to the mass per unit volume of the liquid at a temperature of 15 (commonly used in kg m3); Specific gravity, also known as relative density, is the ratio of the density of a liquid at 15 to the density of the same volume of water at the same temperature.

4. Pour point. The lowest temperature at which the cooled oil can flow.

5. Flash point. It is a comprehensive indicator of the fire risk of the substance, which should generally be higher than 20-30°C.

6. Demulsibility.

It refers to the ability of oil to separate from water, also known as water separation.

7. Neutralization value.

The neutralization value actually includes the total acid number and the total base number. However, unless otherwise noted, it is generally stated"Neutralization value", in fact, only means"Total acid number", which is also in mgkoh g.

In terms of comprehensive performance, it must be a fully synthetic engine oil, which has better high-temperature stability than mineral oil, so the engine will not lose power at high temperatures, and the lubricity will not decrease.

The lubrication strength of each part of the engine depends on the environment, relative movement speed of the part and the size of the mechanical and thermal load.

There are four types of lubrication.

Pressure lubricationPressure lubrication is the use of oil pressure to transport oil to various friction surfaces for mandatory lubrication, such as crankshaft main bearings, connecting rod bearings and camshaft bearings, etc., which need to convey oil to the gap of the friction surface with a certain pressure.

Splash lubrication: The operation of the crankshaft is used to throw the oil out from both sides of the bearing, forming many oil droplets or oil mist in the crankcase, and splashing on the friction surface for lubrication, such as cylinder walls, piston pins, etc.

Integrated lubrication (pressure and spatter combined).: This method is widely used in modern automobile engines.

Grease lubrication: Engine accessories such as generators, water pumps and other bearings are lubricated with grease, which need to be refilled or cleaned and replaced regularly.

Maintenance precautions:

1. Clean the air filter.

The air filter is directly related to the air intake of the engine during the driving of the car, the manager of the Guangben dealership told reporters that the vehicle is only driving in the city, and the air filter will not be blocked, but if the car is driven on a dusty road, it is necessary to pay special attention to the cleaning of the air filter.

If the air filter is blocked or too much dust accumulates, it will cause the engine to be poorly intake, and a large amount of dust enters the cylinder, which will accelerate the speed of cylinder carbon deposition, so that the engine ignition is not smooth, the power is insufficient, and the fuel consumption of the vehicle will naturally increase.

If driving on a normal city road, the air filter should be checked when the car is driving 5000 kilometers, and if there is too much dust on the filter, you can consider blowing compressed air from the inside of the filter to the outside to blow the dust away. However, the pressure of the compressed air should not be too high to prevent damage to the filter paper. He told reporters that no water or oil should be used when cleaning the air filter to prevent oil and water from contaminating the filter.

2. Remove throttle sludge.

There are many reasons for the formation of sludge at the throttle, some of which are carbon deposits formed at the throttle by the exhaust gas of fuel combustion; Then there are the impurities that are not filtered by the air filter and remain at the throttle. The increase in oil sludge will cause air resistance, which will lead to an increase in fuel consumption. Generally, the throttle valve should be cleaned when the car is driving 10,000 to 20,000 kilometers.

3. Clean the fuel injector for carbon deposit.

Because the combustion chamber is prone to carbon deposits, which can lead to difficulties in start-up; Carbon deposition at the fuel injector will also lead to oil channel blockage, gasoline injection deformation, poor atomization, and fuel consumption will naturally increase.

For the cleaning of the combustion chamber, a special decarbonizer can be used to soften the carbon deposits on the combustion chamber and fuel injector and detach from the surface of the parts, and then remove the softened carbon deposits. This carbon removal method has a good effect, and has the advantages of not damaging the surface of the parts compared with the previous direct wiping, and the efficiency of carbon removal has also been greatly improved.

(1) Pressure circulation lubrication: for friction surfaces bearing large loads, such as main bearings, connecting rod bearings, camshaft bearings, etc.

2) Splash lubrication: for friction parts that are difficult to reach or bear little load by pressure oil feeding, such as cylinder walls and timing teeth.

Pressure lubrication, splash lubrication, self-lubrication.

1. Pressure lubrication 2Splash lubrication 3, grease lubrication.

The selection principles of automotive lubricants are as follows:1. The higher the working environment temperature, the higher the viscosity of the lubricating oil; 2.

The higher the working load, the higher the macro viscosity of the lubricating oil to ensure that the oil film has sufficient strength; 3.The smaller the gap between the friction surfaces, the lower the viscosity of the lubricating oil to ensure sufficient oil flow between the two friction surfaces; 4.Between the vertical friction surfaces, the viscosity of the lubricating oil should be higher to reduce the loss of oil.

Lubricant is a liquid or semi-solid lubricant that is used in various types of automobiles and mechanical equipment to reduce friction and protect mechanical and machined parts. It mainly plays the role of lubrication, cooling, rust prevention, cleaning, sealing and buffering.

Classification and use of industrial lubricants.

1.anti-wear hydraulic fluid; Anti-wear hydraulic oil is generally used in the hydraulic system of construction machinery and die-casting machines, and the medium and high hydraulic systems of construction, hardware, plastic wide materials, machine tools, etc. , as well as some gearboxes, bearing lubrication systems and other lubrication systems that have special needs for anti-wear and anti-oxidation.

2.air compressor oil; Air compressor oil is used in various domestic or imported air compressors.

3.industrial gear oils; Industrial gear lubricants are used to lubricate gear transmissions with a wide range of loads.

4.machine tool spindle oil; Guide oil and spindle oil are suitable for the lubrication of spindles, guide rails and other parts of modern CNC machining centers, grinding machines, lathes, planers, drilling machines and other mechanical equipment.

5.Vacuum pump oil is used to lubricate various mechanical vacuum pumps.

The principles of use of automotive lubricants are as follows:1. The higher the working environment temperature, the higher the viscosity of the lubricating oil; 2.

The greater the working load, the higher the viscosity of the lubricating oil to ensure that the oil film has sufficient strength; 3.The smaller the gap between the friction surfaces, the lower the viscosity of the lubricating oil to ensure that enough oil enters between the two friction surfaces; 4.Between the vertical friction surfaces, the viscosity of the lubricating oil should be higher to reduce the loss of oil.

Lubricant is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction, guarantee machinery and produce processed parts. It plays a key role in lubrication, cooling, rust prevention, cleaning, sealing, and buffering. Classification and use of industrial lubricants.

anti-wear hydraulic fluid; Anti-wear hydraulic oil is mostly used in the hydraulic system of construction machinery and die-casting machine, the medium and high hydraulic system of construction, hardware, plastics, machine tools, some gearboxes, shaft base bearing lubrication systems and other special anti-wear and anti-oxidation lubrication systems. 2.air compressed engine oil; Compressor oil is used in various domestic or imported air compressors.

3.industrial gear oils; Industrial gear lubricants are used to lubricate gear height transmission and withering devices for various loads. 4.

machine tool spindle oil; Guide oil and spindle oil meet the requirements of objective conditions, and are used to lubricate the spindle and guide rail of modern CNC production machining centers, grinding machines, lathes, planers, drilling machines and other mechanical equipment. 5.Vacuum pump oil is used for the lubrication of various mechanical vacuum pumps.

That's all for you. Do you understand everything after reading it? What are the principles for selecting automotive lubricants? I don't know what everyone Qi Dong thinks. If you want to know more, keep reading the other articles of this **!

1. It has good viscosity temperature performance and suitable viscosity;

2. The corrosion of the machine parts should be small.

3. It has good cleanliness and dispersion;

4. Strong ability to neutralize acids;

5. Good antioxidant stability;

Different engine requirements are different, such as Japanese and German.

The selection principles of automotive lubricating oil are: 1. The higher the working environment temperature, the higher the viscosity of the lubricating oil; 2. The larger the working load, the higher the viscosity of the lubricating oil to ensure that the oil film has sufficient strength; 3. The smaller the gap on the friction surface, the lower the viscosity of the lubricating oil, so as to ensure that there is enough oil flowing between the two friction surfaces; 4. Between the vertical friction surfaces, the viscosity of the lubricating oil should be higher to reduce the loss of oil.

Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and processed parts, mainly playing the functions of lubrication, cooling, rust prevention, cleaning, sealing and buffering.

Classification and use of industrial lubricants.

1.anti-wear hydraulic fluid; Anti-wear hydraulic oil is generally used in the hydraulic system of construction machinery and die-casting machine, medium and high hydraulic systems such as construction, hardware, plastics, machine tools, etc., as well as gearboxes, bearing lubrication systems and other anti-wear and anti-oxidation lubrication systems.

2.air compressor oil; Air compressor oil is used in a variety of domestic or imported air compressors.

3.industrial gear oils; Industrial gear lubricants are used for the lubrication of gear transmissions with a wide range of loads.

4.machine tool spindle oil; Guide rail oil and spindle oil are suitable for the lubrication of spindles, guide rails and other parts of various mechanical equipment such as modern CNC machining centers, grinding machines, lathes, planers, drilling machines, etc.

5.Vacuum pump oil is used for lubrication of various mechanical vacuum pumps. (Photo by Huang Yuejin) @2019