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Selection Principle of Automobile Lubricating Oil
Jan 18, 2018

Selection Principle of Automobile Lubricating Oil


1. How to select internal combustion engine oil


     1) Oil is chosen according to the characteristics of internal combustion engine and vehicle, that is, oil is selected for loading and rotating speed. For those with high load and low speed, for example, some large bulldozers, cranes and drilling rigs, oil with high viscosity is generally used. For example, SF40 CD50, high speed light load, such as cars, jeeps, small power equipment generally use less viscosity lubricating oil, such as SG15W / 40 SF30.

   2) according to the severity of internal combustion engine work, for example, the first ring temperature of diesel engine is higher than 230 ~ 250 ℃, the strengthening coefficient is more than 5, and the supercharged diesel engine oil uses oil above CD, such as CD40. SG/CD40 etc. Gasoline engine according to compression ratio and whether there is crankcase positive pressure air exchange, exhaust gas recirculation and catalytic converters, etc., the higher the compression ratio, the higher the oil level, with the above additional devices. Generally use SG above the oil.

   3) the ratio of oil capacity to power is also the factor of oil selection, and the ratio of oil capacity to power is also the factor of oil selection. Low oil capacity requires high quality of oil. Engines produced in Europe are generally small in size and high in power, requiring the use of high quality oil, such as SHSJ.

   4) choose oil according to region, season and temperature. In cold winter region, choose oil with low viscosity and low pour point or multilevel oil, such as Northeast China, can choose SF10W/30. SH5W/30 et al. Areas with higher temperature throughout the year, such as Hainan Province and Liangguang region, can choose oil with high viscosity, such as SF 40 CD 50.

   5) Choose oil according to the wear condition of the engine. The new engine should choose the oil with lower viscosity (consider saving energy, but wear more. The engine with large clearance between cylinder wall and piston should choose one with high viscosity.


2. How to select gear oil

   1 ) GL - 4 , GL - 5 grade oil , GL - 3 oil and old brand No . 18 # and 24 # hyperbolic gear oil cannot be used.

  2) choose gear oil with different viscosity according to ambient temperature. For example, 75 W / 90 is especially suitable for cold winter. 80 w / 90 / 85 w / 140 of oil in East China, Central China, North China in Winter and Summer General, South China, Southwest region in Winter; 90,140 of the oil is available throughout the country in summer and winter in southern China.

  3) GL-4 is suitable for medium and low load vehicles and GL-5 is suitable for heavy duty vehicles.

  4) Car manual gearbox requires gear oil, generally 80 W / 90 or 85 W / 90 oil, the best use of GL-4 GL-5 grade oil.