资讯详情
Common problems and treatment of diesel engine oil
浏览量:1442次
Diesel engine oil is one of the most widely used diesel engine oils. However, due to the lack of understanding and improper use of diesel engine oil, there are more or less problems in the selection, use and maintenance of diesel engine oil.
Mixing of diesel engine oil
The composition of diesel engine oil can be divided into mineral oil type and synthetic oil type. Generally, the same series of mineral oil type diesel engine oil produced by the same manufacturer can be mixed; however, different series of products can not be easily mixed. In addition, mineral oil type must not be mixed with synthetic oil type; different oil products, i.e. using the same type and the same performance level, due to the different raw materials used, avoid adverse reactions, do not mix. Therefore, when a certain diesel engine oil is found to be short of oil after a certain period of time, and the same kind of oil is in short supply temporarily, some oil of the same type from the same manufacturer can be added.
The grade judgment oil of diesel engine oil usually refers to the oil with high performance level. The English alphabet is more backward. For example, ci-4 is better than CH-4. The grade mainly compares with the performance level. Viscosity grade refers to the grade
SAE 40 is not lower than SAE 15w-40, but the climate conditions are different. Sometimes the price of the same energy grade oil, such as CD 15w-40, is slightly higher than that of CD 40 oil. The main reason is that the proportion of raw materials used in the two is different. The cost of the former is higher than that of the latter, but the grade of oil is the same.
The higher the viscosity of diesel engine oil is, the better the oil film theory is. The thickness of oil film determines the strength of lubrication performance. The higher the viscosity, the thicker the oil film and the better the lubricity, but the cooling effect is poor. New generation products no longer rely on thick oil film for lubrication, and the performance of additives plays a major role. In order to save energy, low viscosity oil is more and more popular. The lower the viscosity of oil, the smaller the resistance, the easier to start and the less energy consumption.
Therefore, under the premise of meeting the lubrication requirements, low viscosity oil should be selected as far as possible. It is not economical to use oil with too high viscosity. Of course, the piston and cylinder of an old car engine wear a lot, and there is a large gap between them. In order to effectively seal the engine, the oil with higher viscosity can be selected. The drawing of diesel engine oil is not necessarily a good oil. Many people inspect the quality of diesel engine oil and pinch it with a little oil with their fingers. If the two fingers open, if there is drawing, it is considered as good oil, that is to say, the drawing oil is sticky enough and has good lubricity. This is a wrong view. Generally, the oil with "W" is blended with tackifier. When the shear performance of tackifier is poor, it will be in drawing state. These oils are easy to become thin after use, so that they can not maintain lubrication and damage the machine. Therefore, oil drawing is poor oil, so do not use it.
The lighter the color of diesel oil is not necessarily the better
Drivers sometimes look at the appearance of the oil when choosing oil products. Many people think that light transparent diesel engine oil is better than dark oil. The color of diesel engine oil is not the main basis for the selection of diesel engine oil. Because the colors of products produced by different raw materials are different, even if the products produced by the same formula are produced, the colors of oil products in different batches cannot be completely the same. Therefore, it is unscientific to judge the quality of engine oil by the color of the oil. The blackening of diesel engine oil after use is not necessarily a good one. Drivers and repairmen often encounter the phenomenon that diesel engine oil turns black after one or two weeks of use, just like ink. Therefore, it is too hasty to judge the oil as fake oil. Indeed, if the oil grade is too low, or the oxidation stability is not good, or without additives, this phenomenon will occur. However, most of the reasons why the engine oil is prone to blackening is still related to the vehicle condition. The combustion performance of vehicles is not good, especially for diesel vehicles. Soot generated from incomplete combustion will enter the engine oil and pollute the engine oil to make it black, especially for old or overhauled vehicles. In addition, the old engine oil is not drained completely, and the residual sludge, carbon deposit and paint film in the crankcase are not cleaned. After adding new oil, due to the strong cleaning function of new oil, these problems will be solved The residue is washed out and suspended in the oil, making it black. In addition, the engine oil of the car with high oil consumption is easy to blacken due to burning oil.
Mixing of diesel engine oil
The composition of diesel engine oil can be divided into mineral oil type and synthetic oil type. Generally, the same series of mineral oil type diesel engine oil produced by the same manufacturer can be mixed; however, different series of products can not be easily mixed. In addition, mineral oil type must not be mixed with synthetic oil type; different oil products, i.e. using the same type and the same performance level, due to the different raw materials used, avoid adverse reactions, do not mix. Therefore, when a certain diesel engine oil is found to be short of oil after a certain period of time, and the same kind of oil is in short supply temporarily, some oil of the same type from the same manufacturer can be added.
The grade judgment oil of diesel engine oil usually refers to the oil with high performance level. The English alphabet is more backward. For example, ci-4 is better than CH-4. The grade mainly compares with the performance level. Viscosity grade refers to the grade
SAE 40 is not lower than SAE 15w-40, but the climate conditions are different. Sometimes the price of the same energy grade oil, such as CD 15w-40, is slightly higher than that of CD 40 oil. The main reason is that the proportion of raw materials used in the two is different. The cost of the former is higher than that of the latter, but the grade of oil is the same.
The higher the viscosity of diesel engine oil is, the better the oil film theory is. The thickness of oil film determines the strength of lubrication performance. The higher the viscosity, the thicker the oil film and the better the lubricity, but the cooling effect is poor. New generation products no longer rely on thick oil film for lubrication, and the performance of additives plays a major role. In order to save energy, low viscosity oil is more and more popular. The lower the viscosity of oil, the smaller the resistance, the easier to start and the less energy consumption.
Therefore, under the premise of meeting the lubrication requirements, low viscosity oil should be selected as far as possible. It is not economical to use oil with too high viscosity. Of course, the piston and cylinder of an old car engine wear a lot, and there is a large gap between them. In order to effectively seal the engine, the oil with higher viscosity can be selected. The drawing of diesel engine oil is not necessarily a good oil. Many people inspect the quality of diesel engine oil and pinch it with a little oil with their fingers. If the two fingers open, if there is drawing, it is considered as good oil, that is to say, the drawing oil is sticky enough and has good lubricity. This is a wrong view. Generally, the oil with "W" is blended with tackifier. When the shear performance of tackifier is poor, it will be in drawing state. These oils are easy to become thin after use, so that they can not maintain lubrication and damage the machine. Therefore, oil drawing is poor oil, so do not use it.
The lighter the color of diesel oil is not necessarily the better
Drivers sometimes look at the appearance of the oil when choosing oil products. Many people think that light transparent diesel engine oil is better than dark oil. The color of diesel engine oil is not the main basis for the selection of diesel engine oil. Because the colors of products produced by different raw materials are different, even if the products produced by the same formula are produced, the colors of oil products in different batches cannot be completely the same. Therefore, it is unscientific to judge the quality of engine oil by the color of the oil. The blackening of diesel engine oil after use is not necessarily a good one. Drivers and repairmen often encounter the phenomenon that diesel engine oil turns black after one or two weeks of use, just like ink. Therefore, it is too hasty to judge the oil as fake oil. Indeed, if the oil grade is too low, or the oxidation stability is not good, or without additives, this phenomenon will occur. However, most of the reasons why the engine oil is prone to blackening is still related to the vehicle condition. The combustion performance of vehicles is not good, especially for diesel vehicles. Soot generated from incomplete combustion will enter the engine oil and pollute the engine oil to make it black, especially for old or overhauled vehicles. In addition, the old engine oil is not drained completely, and the residual sludge, carbon deposit and paint film in the crankcase are not cleaned. After adding new oil, due to the strong cleaning function of new oil, these problems will be solved The residue is washed out and suspended in the oil, making it black. In addition, the engine oil of the car with high oil consumption is easy to blacken due to burning oil.