The blackening of the engine oil is probably a common problem of all car owners. Why does the oil turn black? Is the oil blackening normal? Is it necessary to change the oil when it turns black?
Today, I will show you the reason why the engine oil turns black.
First of all, it is normal for the oil to turn black after using for a period of time. The blackening of the oil does not mean that the oil must be replaced.

There are many reasons for oil blackening, so first understand why the oil blackens, and then consider whether to change the oil.
Why does the oil turn black?
1. The oil filter was not changed when the engine oil was changed
"Mechanical filter" is the abbreviation of engine oil filter, which is used to remove dust, metal particles, carbon deposits, soot particles and other impurities in the engine oil and protect the engine. After a period of time, there will be oil sludge, metal particles and other impurities in the machine filter. Therefore, if the machine filter is not changed when the engine oil is changed, the dirty machine filter will soon stain the new engine oil black.
Moreover, the detergency and dispersion of the oil itself can inhibit the formation of carbon deposition, oil film and sludge; It is one of the important performance indicators of engine oil to wash the generated sediment into the lubricating oil to remove it.
The carbon deposits and oil sludge washed out are all black, and the oil will turn black naturally.
2. Poor fuel quality
If poor quality fuel is used, incomplete combustions such as sludge and soot are likely to form in the engine, and these incomplete combustions will directly lead to the blackening of the engine oil.

3. Poor driving conditions

If the driving conditions in the city are poor and the engine needs to be started and stopped repeatedly, the engine will not be able to run at the normal speed for a long time, resulting in insufficient fuel combustion, generating sludge and soot, which will lead to the blackening of the engine oil.
4. Oxidation and blackening of engine oil
When the engine is working, the temperature and pressure are very high. The oil has been circulating in this environment, and it will slowly oxidize and discolor.
We can think of it this way: when frying chicken legs at home, we are not willing to change the oil. A pot of oil is fried there again and again. Is the oil getting darker and darker?
In fact, the oil is also starting to oxidize and deteriorate.
The oil turns black. It is recommended to change the oil according to the maintenance manual
So generally speaking, blackening of the engine oil is a normal phenomenon, and generally the engine oil will leave a little longer life, so don't worry about failure.
When changing the oil, it is recommended to follow the maintenance manual. If you are not sure, you can also call the 4S store and the lubricant manufacturer's hotline. They will definitely tell you the interval and the corresponding oil model.

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