Choose oil lubricating oil is not the "glue" the better
Says, the main performance index of the lubricating oil has two, the first aspect is the level of performance indicators, lubricating oil on the international evaluation is to adopt the standard of API (American petroleum institute). Gasoline lubricating oil with "S", said the SF, SM; The alphabetical order on behalf of the development of lubricating oil quality and the progress of additive, the higher the level of engine protection effect, the better, while diesel engine oil with "C" said. On the other hand for viscosity grade, viscosity level is made by the American society of automotive engineers of automobile engine oil viscosity grade The standard. The viscosity grade when 100 ° C, is divided into 20, 50, the greater the number, the higher the viscosity. Low temperature viscosity into 0 w, 25 w, the smaller the number, the better low temperature performance. Recently, the owner Mr. Liu found that car oil pressure lower than some time ago. In order to make oil recovery "normal", Mr Liu decided to add high viscosity lubricating oil to cars. But, in explaining why choose after the cause of the high viscosity of lubricating oil, lubricating oil sales stores is "no" to his request. Is this why?
Is not the "glue" the better
Choose viscosity to "suit the administer"
Viscosity of lubricating oil for the protection of the engine is very important, only when the lubricating oil has enough viscosity, to ensure that at various temperatures can be kept the oil film between engine parts, in order to ensure the normal operation of the engine. Therefore, remind the owner, the choice of lubricating oil during the summer, the owner should be the pitfalls of "the more viscous, the better", and should, according to the actual shape car, and the timely weather and engine temperature, selecting the appropriate level of quality. In fact, the "lubricating oil more sticky, the better" is a very one-sided understanding. The greater the viscosity, is beneficial to prevent the wear of friction surface, but with the frictional resistance will also increase, increase power loss.
"Summer used lubricating oil has 20, 30, 40, 50, such as four levels, the greater the number on behalf of its viscosity, the greater the applicable and the higher the temperature. Summer high ambient temperature, engine working temperature becomes higher, more likely to lead to the high temperature of the oil oxidation. So choose oil during the summer, should choose to stick high temperature stability, resistance to high temperature oxidation ability of high grade oil. According to the xi 'an summer temperature, choose the level of 10 w / 40 viscosity lubricating oil is more appropriate." Said that if the vehicle condition is not very good, the condition of a slight burn oil, or often need to reload the goods, can choose the lubricating oil of 15 w / 50, avoid caused by oil viscosity is too low oil pressure is too low, cause unnecessary trouble. In addition, if the car engine parts clearance is bigger also can choose ?
"A number of factors are likely to lead to low oil pressure, not just because the lubricating oil viscosity reduced. As long as not beyond the normal range of regulations, will not cause much impact to the road." Said, "if found anxious burnt flavour, lubricating oil is not enough, black, be sure to change in time." Stressed that choose lubricating oil, the owner had better be to brand shop to choose purchase, so as not to buy fake products.
Knowledge of the car
The correct understanding of lubricating oil
If the engine as the heart of the car, the lubricating oil is the "blood" car flow. So, replace the viscosity suitable lubricating oil has become one of the owners summer subsidy key. "In the heart of the car, engine wear and tear is inevitable, and the role of the lubricating oil, is to minimize the degree of wear of engine, its viscosity is inversely proportional to the temperature, the higher the temperature, the lower the viscosity." Shaanxi lanxiang WuMao co., LTD. The manager said that the summer temperature is higher, so the engine oil film and high temperature resistance and higher requirements are put forward. And lubricating oil in the process of work, forming a lubricating oil film on the surface of the engine, this engine lubricating oil film like put on a coat of the very fit. ?
Because of friction between various parts surface heat engine, second only to the engine cylinder combustion heat, and can be used lubricating oil pressure lubrication way to take away heat, thus ensuring the normal operation of the friction surface. After the heated oil, through the way back to the oil sump oil cooling. Explained, from the structure of the engine, is located in the engine oil pan at the bottom, and the exposed to the air, thermal conductive performance is generally good materials, lubricating oil through its air cooling, cooling after lubricating oil and was taken to the lubrication chart Surface. Viscosity of lubricating oil for the protection of the engine is very important, only when the lubricating oil has enough viscosity, to ensure that at various temperatures can be kept the oil film between engine parts, in order to ensure the normal operation of the engine. Have data show that the oil viscosity reducing 1 CST, save fuel about 1.5% %. In addition, the experiments have proved that the lubricating oil viscosity is beyond the requirements, will also increase the wear parts. Because, two-thirds of which are found in the initial parts wear. Use viscosity of lubricating oil in low temperature start, because after a period Downtime, between the friction surface of lubricating oil has been lost, and large viscosity flow is slow, can't timely added friction surface oil film formation, thus can make the parts for a long time in dry friction and half dry friction condition, resulting in parts wear increase. So, can choose according to the circumstance of high viscosity in the summer, but is by no means the greater the viscosity of engine lubricating oil, the better, but should be in guarantee under the condition of lubrication, sealing, try to choose low viscosity lubricating oil. "Summer oil oxidation speed of perishable, so always check the oil, oil, and change in time. Also can consider to choose high quality levels, oxidation resistance is strong, some oil." Suggested.
