About oil, these questions, you probably want to know the most.
1 Can the depth of the oil color reflect the performance of the oil?
Oil color depends on the formula of base oil and additives, different base oil and additive formulations will make the oil show different shades of color.
The performance of the oil is evaluated through a series of engine bench tests and real road tests, which test the performance of the oil from oxidation, corrosion, sediment, sticky ring, sludge, abrasion, wear and other aspects.
2 Easy to turn black oil must be bad?
Not necessarily, some excellent oil contains additives that can dissolve carbon deposits inside the engine, so it is easy to black, but it has no effect on the performance of the oil.
3 Why should I change the oil regularly?
Oil will gradually deteriorate during operation, the main reasons are:
① Combustion by-products: such as water, acid, soot, carbon, etc.;
② fuel oil dilution;
③ High temperature oxidation deterioration of the oil itself;
④ Dust and metal particles.
These substances are contained in the oil, at the same time, the additives in the oil will also be consumed with the use of the process. If the oil is not replaced on time, it will significantly reduce the protective effect of the oil on the engine anti-wear.
Replacing the oil can not only discharge the pollutants in the oil, but also ensure that the composition of the oil is maintained at a reasonable level.
4 When changing the oil, why is the oil released very thin?
When the oil is changed, it is usually carried out in a hot car state, and the oil viscosity decreases with the increase of temperature, so the viscosity of the oil with a higher temperature is thinner than the viscosity at room temperature, which is a normal phenomenon.
However, when the temperature drops to room temperature, the oil viscosity is still very low, which is likely to be caused by fuel dilution during the use of oil.
5 How to choose oil?
① Recommended by the depot or service station;
② According to vehicle condition;
③ According to the ambient temperature.
6 How to check the quality of the oil in use?
Appearance:
① The oil sample is milky or fog-like, indicating that the oil has entered the water;
② The oil sample turns gray and may be contaminated by gasoline;
③ Turned black, caused by the product of incomplete combustion of fuel.
Smell:
① Irritating odor appears, indicating that the oil is oxidized at high temperature;
② Very heavy fuel smell, indicating that the fuel is seriously diluted (used oil a small amount of fuel taste normal).
Oil drop spot test:
Take a drop of oil onto the filter paper and observe the change of spots.
① Rapid diffusion of oil, no sediment in the middle, indicating normal oil;
② Oil diffusion is slow, and there are deposits in the middle, indicating that the oil has become dirty and should be replaced in time.
Burst test:
The thin metal sheet is heated to more than 110 ° C, drop a drop of oil, such as oil burst to prove that the oil contains water, this method can detect more than 0.2% water content.
7 What are the reasons for the oil alarm light?
The oil light is mainly caused by insufficient oil pressure in the lubrication system, usually for the following reasons:
① The amount of oil in the oil pan is insufficient, and check whether there is a tight seal caused by oil leakage.
② The oil is diluted by the fuel or the engine load is too heavy and the working temperature is too high, resulting in the oil viscosity becoming thinner.
③ The oil passage is blocked or the oil is too dirty, resulting in poor oil supply of the lubrication system.
④ Oil pump or oil pressure limiting valve or bypass valve stuck working badly.
⑤ The clearance of the lubricating parts is too large, such as the crankshaft main bearing neck and the bearing bush, the connecting rod journal and the bearing bush are seriously worn, or the bearing bush alloy is spalling, causing the gap to be too large, increasing the oil leakage and reducing the oil pressure in the main oil passage.
⑥ Oil pressure sensor is not working well.
7 There is no correct choice of oil viscosity according to the climate and engine working conditions.
The selection of too low viscosity oil increases the oil leakage of lubricating parts, causing the pressure of the main oil passage to be low. The selection of excessively high viscosity oil (especially in winter), which causes the oil pump to be difficult or the oil filter to pass through, resulting in low oil pressure in the system.
Post time: Feb-25-2025