Oil can be divided into gasoline engine oil and diesel engine oil. Although gasoline engine and diesel engine work under high temperature, high pressure and high load conditions, there are still great differences between them.
First of all, compression is twice as much as gasoline engine. Diesel engine, its main parts are under much greater pressure than gasoline engine, and some parts are made of the same material. For example, gasoline for the main bearing and rod bearing shell can be used as a cataplasm bit, which has soft texture and good corrosion resistance, while diesel engine bearings must be made of high performance lead bronze or lead alloy materials, but the corrosion resistance is poor.
Therefore, some antirust agents are added to diesel engine oil in order to produce a protective film on the bearing surface, reduce the corrosion of the bearing and improve its wear resistance. Because gasoline engine oil does not contain antirust agent, if it is added to the diesel engine, bearing shell is prone to spot, linen, or even flake fall off in use, and the oil will soon deteriorate.
In addition, diesel oil contains more sulfur than gasoline, and harmful substances in combustion process will form sulfuric acid or sulfite. As high temperature and high pressure gas pipelines enter the oil pan, accelerating oxidation and deterioration of oil, it needs to add antioxidants in diesel oil, oil base. If there is an acid gas sensor, it can play a neutral role and will not make the oxidation of oil too fast. The gasoline engine oil does not contain this additive, so it should be neutral. If it is used in diesel engine, it will lose efficacy quickly due to the corrosion of acid gas. Therefore, the oil which needs diesel engine and diesel car can not replace gasoline engine with engine oil.
2. Domestic automobiles use imported petroleum
Now some people think that imported petroleum must be better than domestic petroleum, so using imported petroleum in domestic cars, especially in new cars, often has many defects. For example, the viscosity of most imported petroleum is low and can not meet the demand of domestic viscosities for petroleum. Considering the thermal expansion system of domestic engine accessories and the matching clearance of imported automobiles, and most Chinese-made engines do not have oil radiators, if imported petroleum is used, the pressure of oil diluted by petroleum is low, even can not meet the requirements. The fixed working pressure can not meet the normal needs of lubrication, wear engine.
3. Blind selection of lubricant grade
Lubrication quality of lubricating oil is directly related to the length of engine life, especially the new type of automobile lubricating oil requirements are very strict, the choice of lubricating oil, replacement, how to meet the requirements of manufacturers.
When selecting engine oil, attention should be paid to both quality grade and viscosity grade. Then the viscosity is selected according to the temperature and load level. High quality oil can ensure good lubrication performance, reduce wear and tear, prolong the service life of the engine, and prolong the oil exchange cycle. When choosing the oil viscosity, besides the temperature conditions, the lubrication and sealing conditions of the engine should be guaranteed, and the low viscosity oil should be selected as far as possible to save fuel.
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