How to access protected trade databases

Oil and How to access protected trade databasesengine: How to choose the right oil? As the most important lubricant and coolant of the engine, oil plays a crucial role in protecting the engine. And how to choose the right engine oil is also an issue that every car owner must seriously consider. This article will introduce in detail the classification of engine oil, the interpretation of engine oil parameters and how to choose the appropriate engine oil. I. Classification of engine oil 1. Mineral oil engine oil Mineral oil is processed by extracting crude oil.Because its raw materials are relatively simple, its price is relatively cheaper. However, its disadvantage is poor fluidity at low temperature and poor high temperature resistance, so its service life is relatively short. Two. Synthetic oil engine oil synthetic oil engine oil is an engine oil synthesized by artificially synthesized chemical Polyff synthetic oil or other synthetic methods. At low temperatures and high temperature resistance, the performance is better than that of mineral oil engine oil. But its price is relatively higher. 3. Semi-synthetic oil semi-synthetic oil is a mixture of synthetic oil and mineral oil in a certain proportion. Compared with mineral oil, its performance has been greatly improved, and the price is relatively more affordable. It is the most widely used in the market. II. Interpretation of engine oil parameters 1. Viscosity Viscosity is an important indicator of oil performance, which is usually represented by W. It refers to the viscosity of the lubricating oil at the temperature of the working environment.As the temperature of the oil rises, the relative viscosity will decrease, so the lower viscosity represents better lubrication performance. Two. SAE standard SAE standard is formulated by the American Society of Automotive Engineers, which represents the viscosity level of the oil. Among them, the W mark indicates the viscosity level of the oil at low temperature, and the following number represents the viscosity level of the oil at high temperature. For example, SAE 5W-30 indicates that the viscosity level of the oil at low temperature is 5 and the viscosity level at high temperature is 30. Usually, the smaller the low-temperature viscosity level, the better the low-temperature fluidity of the oil. The advantage is that the engine can lubricate everywhere faster when the cold car starts. 3. API classification API is the oil quality standard of the American Petroleum Institute. It is divided into different levels such as SJ, SL, SM, SN, etc. Each level represents a certain degree of oxidation resistance, cleanliness, friction reduction and other properties.Vehicle manufacturers usually recommend using a specific API level, so you need to pay attention when buying engine oil. III. How to choose the right engine oil 1. Choose the appropriate oil according to the year and brand of the vehicle. Different vehicles need to use different oils, so you need to check the owner's manual or ask the professionals at the car repair station to determine the type of oil of the vehicle. Two. Choose engine oil according to the usage environment. Depending on the positioning of the vehicle used, the oil is also different in the choice. If the vehicle is used frequently and often drives in a high-temperature environment, it is recommended to choose high-performance fully synthetic oil to ensure the service life of the oil. 3. Select according to the performance index of the oil. Different oil performance indicators are different, so they need to be selected according to different vehicles and usage occasions. ExampleFor vehicles used in cold areas, it is recommended to choose some types of oil that are easy to flow in low cold to bring better lubrication effect and ensure smooth oil routes. In summary, the correct choice of engine oil has a great impact on the life of the engine. It is recommended that vehicle users should fully consider factors such as the brand and model of the vehicle, the environment and the performance indicators of the oil when purchasing engine oil, and choose the appropriate engine oil according to their own needs and conditions, so as to achieve longer-term maintenance effect and higher cost performance.

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