The car oil does not turn black, is it necessary to change it?

Engine oil also has an expiration date, after all, there is a fine powder of moisture and gear friction after use, and it must be replaced regularly to ensure the normal operation of the engine.

If you don't drive often, change the oil at least 3 times in 2 years, and it is best to replace and maintain your car in 6 months.

Normal. It is very normal for the engine oil to be very black, the engine oil turns black because the engine oil plays a role in the operation of the engine, in addition, when the engine is working, the temperature and pressure are very high, the engine oil has been circulating in this environment, and it will slowly oxidize and turn black.

It is not caused by the deterioration of the oil. Therefore, if the oil is very black, if you don't use inferior oil, if you don't maintain the car according to the maintenance manual, under normal circumstances, the oil is very black, it is no big problem.

The composition of the motor oil is base oil + additives. This is true for mineral, semi-synthetic or fully synthetic oils. However, these are only the base oils of engine oils, and the types and formulas of additives seem to be similar to those actually used, but they are very different.

The main role of additives in lubricating oil is to improve and enhance the various properties of engine oil, so that the oil has better lubrication, cleaning, cooling, sealing, anti-rust and anti-corrosion, cushioning and shock absorption. The types of additives can be as many as more than 10 kinds, according to the formula needs to increase and decrease the amount to meet the characteristics, that is to say, the higher the grade oil, not only the better the base oil used, the more types of additives, the better the quality and naturally.

There are many types of additives in motor oil, and one of them is called"Cleaning dispersants"。It can be chemically neutralized with gum, sludge and other chemicals in engine oil. In other words: it can remove the glue, sludge and other dirt inside the engine"Wash it down"。

The carbon deposits and oil sludge in these engines are all black in color, and the oil will naturally turn black, and after being washed off, the oil color will naturally turn black, so it is very normal for the oil to be very black.

It is precisely because of the high content of dispersant that the engine oil has a strong cleaning ability"black fast", while the oil with a low content of cleaning dispersant is just the opposite. If you use thousands of kilometers of engine oil, the color has not changed at all, and it is still crystal clear, which is abnormal, and it is likely that the cleaning ability of this engine oil is too poor, resulting in it"Nothing washes off".

This oil has a certain lifespan, with time and kilometers limited. It's not that if it's dark, it needs to be replaced. If it turns black, it will turn black after hundreds of kilometers.

Under normal circumstances, the oil mineral oil is changed every six months or 5000 kilometers. If you change the fully synthetic engine oil, you can change it once a year or 10,000 kilometers.

Hello: Engine oil is equivalent to the "blood" in the automobile engine, which flows between the engine parts, plays a lubricating role, and prevents serious wear and tear between parts and components; In addition to this most important function, it also has some "additional functions", such as cooling and cooling, cleaning and cleaning, sealing and leakage, rust and corrosion prevention, shock absorption and cushioning. The main reasons for the blackening of engine oil are as follows:

1.The quality of the fuel, the higher the olefin content in the fuel, the higher the sulfur content, the easier the formation of sludge in gasoline engines, the formation of soot in diesel engines, and the blackening of engine oil.

2.The engine structure and working conditions are different. The sludge in the oil pan of the engine oil engine is mainly caused by the car being stopped and driving, the power is not fully utilized, and the combustion does not completely occur. Diesel engines do not burn completely to form soot, which can easily cause the oil to turn black.

3.The engine is overloaded for a long time, running at high power and high temperatures, and the oil is oxidized and blackened.

4.The replacement cycle is too long, the engine load is large, etc.;

5.Change the oil without cleaning the engine or change the oil filter. After the new oil is added, the new engine oil is polluted by the clean waste oil, and the cleaning function of the new oil removes the original glue, carbon deposits, and sludge from the engine; Once mixed, mix it into the oil to make it black.

Blackened oil doesn't mean it's spoiled, and the quality of the brand** oil on the market is quite high, and it can maintain lubrication at high temperatures. Generally speaking, when new oil is added, sediments such as sludge and carbon deposits on the parts are dispersed in the oil, which will cause the oil to turn black after a certain period of time. An experienced master will use the viscosity of the oil to determine whether it needs to be replaced, rather than observing the color of the oil turning black and concluding that it needs to be replaced.

Change oil according to maintenance interval (minerals: 5000 km or 6 months, semi-synthetic: 7500 km or 9 months; Fully composited:

10,000 km or 1 year; Appropriate adjustment according to the vehicle environment), the selection of higher quality engine oil, regular cleaning of the lubrication system, etc., can effectively alleviate the blackening of the engine oil.

This is calculated according to the time and kilometers, the general car in the use of a better oil can be changed at 8,000 kilometers, oil blackening is a normal phenomenon, the oil itself is lubricated, cleaning effect, do not start to change at about 4000 kilometers, good oil is the best state at this time! Foreign countries will not advocate changing the engine oil after 5000 kilometers! Because there are interest groups in it, all shouting that the lower the better!

Not really! 8000 km to change the engine oil is absolutely no problem!

The working environment of the engine is relatively harsh, and there will be some exhaust gas or carbon deposits into the engine during combustion, and the engine oil plays a role in cleaning and lubrication.

<> "Do you have to change the oil when it turns black?"

The oil has turned black, and it's time for an oil change?

Some pot friends believe that the black color of the lubricating oil is the realization of serious deterioration of the oil, so it has to be changed. In fact, this is only for lubricants that do not have a static dispersant, but the lubricating oil used in modern automobiles is generally added with a static decomposer.

This slower will wash off the adhesive film and black carbon deposits that adhere to the piston and disperse them in the oil, thereby reducing the formation of high-temperature precipitation in the engine, so the color of the lubricating oil is easy to turn black after a period of use, but this does not mean that the oil has deteriorated.

Do you need to change the lubricating oil often?

It is normal for the lubricating oil with a decomposing agent to turn black, and there is no need to change it, but it can't always be added without changing! Replenishment without replacement can only make up for the lack of oil quantity, but cannot fully compensate for the loss of lubricating oil performance. During the use of lubricating oil, the quality will deteriorate due to pollution, oxidation and other reasons, and there will also be some consumption, so that the quantity will be reduced.

In order to make the tung sock lubricating oil give full play to its performance, it still needs to be replaced after a period of use.

Sometimes additives are useful.

Some people believe that adding additives to lubricating oil can play a better role. This understanding is wrong! A truly high-quality lubricant is a finished product with a variety of engine protection functions, a formula that already contains a variety of additives, including anti-wear agents, and the most important thing about the balance of the lubricant is to ensure that the performance is fully realized.

Can you add more oil?

There are also some pot friends who think that they can add more lubricating oil, as if they will suffer if they add less, and they must be filled up every time. The amount of lubricating oil should be controlled between the upper and lower scale marks of the dipstick. Due to excessive lubricating oil, it will enter the combustion chamber from the gap between the cylinder and the piston, and burn to form carbon deposits.

Carbon deposits are not a good thing! These deposits can increase the compression ratio of the engine and increase the tendency to detonation; The red-hot state of carbon deposits in the cylinder is also easy to cause pre-ignition, if it falls into the cylinder, it will aggravate the wear of the cylinder and piston, and will accelerate the contamination of lubricating oil.

It is not necessary to replace the oil when it turns black, but whether to replace it according to the viscosity of the oil. There are two main reasons why the oil turns black quickly:

1. The old engine oil in the engine was not cleaned before the oil was changed, and the new engine oil was mixed with the precipitated old engine oil after being added, causing the new engine oil to turn black.

2. The use of fake and shoddy engine oil has poor lubrication and cleaning ability, resulting in a lot of impurities, and the oil will soon turn black.

Here's how to determine the oil change:

1. Smell method, you can take out the oil dipstick, put it in front of the nose and smell it, if there is a pungent sour smell, this proves that the oil has deteriorated, it should be replaced.

2. Hand pinching method, take out the old engine oil with fingers and grind it repeatedly, if the quality of the oil is OK, the feel is lubricating, if there are impurities, poor viscosity, you should replace the oil.

3. Color identification method, take out a clean white paper, drop a few points of old engine oil, wait for a few minutes, the oil is no powder, and it is very smooth to the touch, if it is dark black and brown, and impurities, it should be replaced.

4. Light method, take out the oil dipstick from the oil tank, hold it to a position of 45 degrees, observe the oil droplets of the oil under the sun, if there is no grinding debris, do not need to replace, otherwise it needs to be replaced.

If the engine oil is black, you must change the engine oil, and you also need to check why the engine oil is black, whether there are impurities inside or the oil is not selected correctly.

When new oil is added to the engine, it quickly turns black. Therefore, it is not necessary to change it when it turns black, and the oil should be changed according to the time limit or kilometers recommended by the manufacturer.

Aconi lubricants answer for you, the oil turns black does not have to change the oil, some oil cleaning performance is good and it turns black just after changing it.

Causes of oil blackening:

1: The olefin content and sulfur content in the fuel are high (sludge is easy to form in the gasoline engine, and smoke stains are easy to form in the diesel engine), which is easy to make the oil blacken and speed up, so the fuel quality is the oil blackening.

2: The structure and working conditions of the engine are different, such as start-stop-stop, which is easy to make the gasoline engine generate sludge, and the diesel engine is not completely burned to form smoke stains, so it turns black.

3: In order to overcome the results caused by the above fuel and machinery, the lubricating oil should add a dispersant to prevent sludge or smoke stains from forming paint film or deposition in the body of the cylinder, the higher the quality of the oil, the better the dispersion, but the oil is easy to turn black, so the high-quality oil turns black faster than the inferior oil, so the black lubricating oil can not become an indicator of the quality of the oil.

4: The sludge produced by the oil turning black is also related to the long-term overload and high-temperature operation of the engine, the engine and the oil bottom are not cleaned when the car changes the oil, and the filterability of the oil filter.

5: Judging the quality of engine oil in driving is not judged by the speed of blackening.

Instead, the internal combustion engine oil is used to change the oil index, and the national regulations are judged according to viscosity, acid value, alkali value, wear, etc., and the color has never been blackened as an index, so it is reasonable to judge in strict accordance with the specified indicators.