Is it normal that the lubricating oil is very thin?[汽车修理知识]

During the oil change and maintenance of the car, the oil discharged from the oil pan is like water. What is going on?
If the oil is drained in a hot car, you will see that the oil is relatively thin, because at high temperatureslubricating oilAs the distance between molecules increases, the viscosity decreases. However, the method for accurately measuring the viscosity of thinness is to measure it with equipment in the laboratory, and the sensory observation is not accurate. The classification of viscosity grade is the restriction on low-temperature fluidity and high-temperature viscosity retention. The viscosity of engine oil at room temperature has no practical meaning, because the lubricating oil is required to be thinner before the engine is started to reduce start-up wear. The temperature of the engine oil will rise rapidly after starting. At this time, the engine oil needs to maintain a certain viscosity to provide sufficient lubrication.
The difference in viscosity of lubricating oils of the same viscosity grade under the same temperature condition is very small, which is not visible directly. Compared with single-grade oil, multi-grade oil has better low-temperature fluidity, so it feels thinner. Carbon particles and high-temperature oxidation are the main reasons for the increase in oil viscosity. Some engine oils have better dispersibility, can disperse carbon particles in the oil, and have strong oxidation resistance, so they feel better fluidity than other oils. Therefore, in the course of use, it is mainly to observe the alarm device of the vehicle oil pressure to judge whether the oil is normal or not, and its viscosity must also be measured with laboratory equipment to be accurate.

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