In hot summer, seasonal replacement of lubricating oil with high viscosity has become one of the key points of the majority of car owners in summer maintenance. However, recently reporters have found a strange phenomenon: due to the lack of understanding of the viscosity of lubricating oil, some car owners excessively pursue the replacement of high viscosity lubricating oil, and even pour out the oil to kiss the "hand" to verify the viscosity; There are also some owners after the replacement of lubricating oil found that the oil pressure gauge is increased, but the suction sludge has increased, the power is also significantly decreased.

I wanted to take good care of my car, but I did not expect to increase the burden of my car, so that my car was "mentally and physically exhausted". This makes many owners puzzled: in the summer how to choose lubricating oil? Is it better to stick with lubricating oil in summer after all?

The higher the viscosity, the better the lubricating oil

The viscosity of lubricating oil is undoubtedly crucial to the normal operation of the engine. In order to prevent the wear of the contact surface between the moving parts of the engine, the lubricating oil must have enough viscosity, so that the oil film can be formed between the moving parts at various operating temperatures, so as to make the automobile engine run smoothly. However, there are at least two drawbacks to using lubricants with excessive viscosity. First of all, when the viscosity is too large than the degree of affecting engine start, it is likely to cause serious wear damage when engine start. Because the viscosity of lubricating oil is too large, the flow is slow, although the oil pressure is high, but the amount of lubricating oil through is not much, can not be timely added to the friction surface. The oil also circulates more slowly, and its cooling and cooling effects become poor, causing the engine to overheat. Because the lubricating oil cycle speed is slow, the number of times through the lubricating oil filter is less, so it is difficult to clean out the metal dust, carbon particles and dust from the friction surface in time.

Another disadvantage of using lubricants with excessive viscosity is energy consumption. Because the viscosity is too large, the friction between the friction surfaces of the parts increases. In order to overcome the increased friction, more fuel is consumed, resulting in a huge waste of energy. It is understood that in foreign countries, low viscosity of lubricating oil has become an international trend. In China, although there is no mandatory requirement for lubricating oil energy saving, low viscosity will be the future development trend. Therefore, to remind the majority of owners, do not use excessive viscosity of lubricating oil, not to think that the greater the viscosity is better.

How to choose the right viscosity level in summer

So how to correctly choose lubricating oil in summer? Under the condition of ensuring lubrication, lubricating oil with low viscosity should be selected as far as possible according to the temperature range, engine temperature and actual vehicle condition. For the engine with good condition and relatively small wear, it can choose the lubricating oil with small viscosity, while for the engine with serious wear and relatively large gap, it can appropriately choose the lubricating oil with slightly larger viscosity.

In addition, because the temperature difference between summer and winter is relatively large, summer oil pressure gauge is generally low. However, as long as it is in the reasonable range stipulated in the manufacturer's driving manual, it is a normal phenomenon, and the majority of owners do not need to panic too much about it. If the oil pressure gauge is abnormally high or low, deviating too much from normal conditions or not within a reasonable range, then it is necessary to thoroughly check to see if there is something wrong with the engine, such as a broken sensor, blocked oil circuit and so on. Do not see the oil pressure gauge is low, on the use of extremely high viscosity lubricating oil.

Under normal circumstances, good oil with the rise of temperature, viscosity changes will be more gentle, and will not quickly dilute. Such as the Great Wall, Shell, Mobil and other well-known brands, although the viscosity is not very high on the surface, but the viscosity is very outstanding when used; And some brand surface "see" rise very "sticky", but use rise however not so, appear intense contrast. It seems that the majority of owners choose lubricating oil or have to recognize the brand. Generally well-known lubricating oil manufacturers will provide a complete range of products, different viscosity levels of lubricating oil for a variety of models to choose, as long as in accordance with normal use habits to choose the appropriate quality level and viscosity level of lubricating oil products.