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A complete knowledge of engine oil that should be understood by both auto repairmen and car owners!!!
- Categories:NEWS
- Time of issue:2019-04-10 13:12
A complete knowledge of engine oil that should be understood by both auto repairmen and car owners!!!
- Categories:NEWS
- Time of issue:2019-04-10 13:12
You may want to know the most about engine oil.
The color of engine oil depends on the formula of base oil and additives. Different formulas of base oil and additives will make the engine oil show different colors.
The performance of engine oil is evaluated through a series of engine bench tests and real vehicle road tests. These tests test the performance of engine oil from oxidation, corrosion, sediment, adhesive ring, sludge, scratch, wear and other aspects.
Not necessarily. Some excellent engine oils contain additives that can dissolve carbon deposits in the engine, so they are easy to turn black, but they have no effect on the performance of the engine oil.
The oil will deteriorate gradually during operation, mainly due to:
① Combustion by-products: such as water, acid substances, soot, carbon deposition, etc;
② Fuel dilution;
③ High temperature oxidation deterioration of engine oil itself;
④ Dust and metal particles.
These substances are contained in the engine oil. At the same time, the additives in the engine oil will be consumed continuously with the use process. Failure to change the engine oil on schedule will significantly reduce the protective effect of the engine oil on engine anti-wear.
Changing the engine oil can not only discharge the pollutants in the oil, but also ensure that the components in the engine oil are kept at a reasonable level.
When changing the oil, it is usually carried out in the hot vehicle state, and the oil viscosity decreases with the increase of temperature. Therefore, the viscosity of the oil with higher temperature is thinner than that at normal temperature, which is a normal phenomenon.
However, when the temperature drops to room temperature, the viscosity of the oil is still very low, which is likely to be caused by fuel dilution during the use of the oil.
① Recommended by the depot or service station;
② According to the vehicle condition;
③ According to the ambient temperature.
Appearance:
① The oil sample is milky white or foggy, indicating that the engine oil has water;
② The oil sample turns gray and may be polluted by gasoline;
③ It turns black and is caused by the products of incomplete combustion of fuel.
Odor:
① Pungent smell indicates that the engine oil is oxidized at high temperature;
② Heavy fuel smell indicates that it is seriously diluted by fuel (a small amount of used engine oil has normal fuel smell).
Oil drop spot test:
Take a drop of engine oil onto the filter paper and observe the change of spots.
① The oil diffuses rapidly and there is no sediment in the middle, indicating that the oil is normal;
② The oil diffuses slowly and deposits appear in the middle, indicating that the oil has become dirty and should be replaced in time.
Burst test:
Heat the thin metal sheet above 110 ℃ and drop a drop of engine oil. If the oil bursts, it proves that the engine oil contains water. This method can detect the water content of more than 0.2%.
The oil lamp on is mainly caused by insufficient oil pressure in the lubrication system, which is usually caused by the following reasons:
① The oil in the oil pan is insufficient, and check whether there is oil leakage caused by loose sealing.
② The oil is diluted by the fuel or the engine is overloaded and the operating temperature is too high, resulting in the thinning of the oil viscosity.
③ The oil passage is blocked or the oil is too dirty, resulting in poor oil supply of the lubrication system.
④ The oil pump or oil pressure limiting valve or bypass valve is stuck and works poorly.
⑤ The fitting clearance of lubricating parts is too large, such as the serious wear of crankshaft main bearing journal and bearing bush, connecting rod journal and bearing bush, or the peeling of bearing bush alloy, resulting in too large clearance, increasing the amount of oil leakage and reducing the oil pressure of the main oil passage.
⑥ The oil pressure sensor is not working properly.
⑦ The viscosity of engine oil is not selected correctly according to the climate and engine operating conditions.
The oil with low viscosity is selected to increase the oil leakage of lubricating parts and reduce the pressure of main oil passage. The selection of engine oil with too high viscosity (especially in winter) will make it difficult for the oil pump to pump oil or the oil filter to pass through, resulting in low system oil pressure.
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