Why does the oil turn black, is it because the engine is malfunctioning?

It's not that the engine is out of order, it's normal for the oil to turn black, because the oil has a cleaning effect, it will clean the sludge impurities in the engine, and it's normal to turn black, I am now using G T magic red oil, which has a good cleaning effect, and the engine is obviously much cleaner than before after two or three times, and the car is brisk to drive, and the engine noise is also smaller.

Cause analysis: There are two main reasons for blackening. The first is due to the action of the detergent dispersant, and the second is due to the oxidation of the oil in use.

If an oil does not turn black during use, it means that the oil is not performing its normal cleaning function at all. Today's engine oils generally contain a cleaning dispersant that absorbs the carbon deposits and oxides of the engine oil from combustion so that they can be replaced during oil changes, thus ensuring that the inside of the engine is clean. Therefore, the blackening of the oil that has just been changed is not necessarily caused by the fact that the inside of the engine is too dirty, as long as the oil is changed at the specified time.

Note: Be sure to change the oil and oil filter (or cartridge) regularly. After a period of use, the viscosity of the oil becomes thicker and acidic products are produced, which will damage the engine components and affect the normal operation of the engine if not replaced regularly.

This is normal. Engine oil has many functions, in addition to the lubrication function, there are also carbon removal, cooling, sealing and other functions, oil blackening is the specific embodiment of the function of removing carbon deposition, as long as the engine starts to run, the oil will begin to take away the carbon black produced by the engine, preventing the engine from forming carbon deposits. When the engine oil turns black, it means that the engine oil is good!

The oil that doesn't turn black is the bad oil. Engine oil needs to be changed regularly, which is basic car maintenance common sense. If you don't change the oil in time, the car looks like there is no problem at the beginning, but after a long time, a small problem accumulates, and the quantitative change causes the qualitative change, and there will be a major failure all of a sudden.

Not necessarily, some good oils contain additives that dissolve carbon deposits inside the engine, so they tend to turn black, but they have no effect on the performance of the oil.

This is not necessarily, the fuel tank must first have a gear or a container, he will have impurities after a long time of oxidation or after the gear runs, it will oxidize, so this is very normal.

The olefin content and sulfur content in the fuel are high (gasoline engines are easy to form sludge, diesel engines are easy to form smoke stains), and it is easy to make the oil black faster, so the fuel quality is the first day the oil turns black.

One of the main reasons is that gasoline is not completely combusted, and it is particularly easy to form black sludge;

The quality of the air filter is not good, and a large amount of dust enters the oil pan and mixes with the oil;

The engine temperature is too high, which causes the oil to oxidize and produce gum and carbon deposits; The engine is overloaded, high-power, and high-temperature operation for a long time, which makes the oil oxidize and turn black;

In addition to extending the life of the engine, it can also reduce the probability of engine failure and reduce fuel consumption.

The oil will be black, which is a normal performance, because one of the five common functions of the oil is cleaning, cleaning carbon deposits, cleaning iron.

The engine oil is very dark, and there are three situations here, the first is the quality of the engine oil, the second is the quality of the oil used before, and the third is the driving habits.

In the first case, the mineral oil cycle is less than 6000 km, semi-synthetic 6000-8000, fully synthetic 8000-15000;

In the second case, no matter what oil you used last time, if there is a problem with the previous oil, it will quickly affect the quality of your last oil, which is very dark, has many impurities, and the filter element is blocked;

The third situation is related to the driving habits and driving environment.

It is normal for the oil to turn black after a period of use, but if it is not blackened, it is abnormal.

It is also normal that there are some carbon deposits and sludge in the engine, and the engine oil has a cleaning effect, and the oil can clean off some of the carbon deposits and sludge.

If you want to completely remove carbon deposits, you need to use walnut sand removal method or use some gasoline additives that are specifically designed to remove carbon deposits, and it is difficult to completely remove carbon deposits with engine oil.

During the normal operation of the engine, the oil will form a layer of oil film on the surface of each component in the engine, which can avoid friction caused by direct contact between the various parts in the engine.

The oil film on the surface of the individual components in the engine also reduces the resistance to movement between the individual parts, which makes the engine run more smoothly.

The oil needs to be changed regularly, if the oil is not changed for a long time, the lubrication performance of the oil will be reduced, and the oil may also appear oxidative deterioration, which will aggravate the wear of the engine.

When using the car at ordinary times, it is necessary to change the engine oil regularly for regular maintenance, otherwise it will affect the normal operation of the engine.

There is no way to judge the working condition of the engine according to the fixed standard of color, and the oil will always turn black, but it is difficult to quantify the extent of blackness.

Oil blackening does not mean that it will get darker over time, but because of the oil's inherent cleaning ability, it will quickly turn black after the new oil is filled into the engine. Carbon deposits and sludge will inevitably be generated during the operation of the engine, in which the carbon deposits cannot be cleaned by the oil, and the two types of sludge will be highlighted.

1. Low-temperature sludge: the engine will produce blow-by gas during operation, which is essentially caused by excessive pressure in the cylinder, which causes insufficient combustion of mixed gasoline, water vapor, impurities and other substances, which are mixed with the oil vapor of the crankcase (the position where the oil is stored); The engine temperature is not very high when the engine is turned off after frequent short-distance low-speed driving, and the gasoline and water vapor in these blow-by gases cannot be effectively evaporated, and the organic oil is mixed and adheres to the inner wall of the crankcase to become sludge.

2. High-temperature sludge: refers to the sludge formed by the oil in the oil passage at the high temperature of the engine, and the reaction of the oil at high temperature causes the molecular polymerization to improve the viscosity of the oil, and the sludge will be formed over time; However, the texture of the oil sludge will become hard at high temperatures, and the frequent flame-out and price reduction and high temperature operation will make the oil sludge brittle, which is the main cause of the oil blackening.

The sludge itself is black, and it seems impossible to quantify how black it can be; Moreover, the cleaning effect of engine oil will decrease or even disappear with the accumulation of time and the proportion of oil sludge cleaned, so it will theoretically not change color after cleaning to a certain extent (black to a certain extent). After the oil cleaning effect loses its effect, the oil sludge will accumulate to a certain extent, and the engine needs to change the oil in order to effectively and timely clean the oil sludge.

After filling the new engine oil, the oil is inside the crankcase, and the oil sludge cannot be effectively cleaned when it is static, and the engine needs to be started for comprehensive cleaning; At the moment of starting, the new oil quickly forms pressure lubrication through the oil pump, so that the oil begins to effectively clean the engine for the first time, and the oil will be released immediately after cleaning once, and the oil will be found to be black, and it will not take long for the oil to reach the "blackest" color, and how long the effective cleaning can not be judged by the color.

Therefore, there is no need to pay too much attention to the color of the engine oil, and the maintenance of the engine only needs to choose the oil according to the type; Ordinary small-displacement self-priming engines can be replaced with semi-synthetic engine oil at 5000 km as the standard, and the scooter small-displacement turbocharger can be replaced with semi-synthetic engine oil at 5000 km as the standard, or with the performance supercharger with full synthetic 10000 km as a standard.

As for the brand, you can choose it yourself, as long as it is a well-known brand and the oil is not fake (too cheap), there is no problem, and there is no need to pay too much attention to the composition and parameters of the oil for ordinary scooters.

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".

1.One of the main reasons why the engine oil is easy to turn black is related to the fuel used, for diesel engines, a large number of carbon particles generated by incomplete combustion of diesel fuel are suspended in the engine oil to make the engine oil black;

2.Secondly, the higher the olefin content in the fuel, the higher the sulfur content, the easier it is to form sludge, and the inside of the engine and the oil pan are not cleaned when changing the oil'The oil sludge is deposited in the oil pan and the inside of the engine, and after the new oil is added, due to the action of the cleaning and dispersing agent in the new engine oil, some oil sludge, carbon deposits, and gum inside the engine are dispersed in the new engine oil to make it black;

3.In addition, the high temperature of the engine causes the oil to oxidize and turn into a colloidal state, and then it is suspended in the oil and black due to the action of the cleaning and dispersing agent in the new engine oil;

4.Finally, the blackening of the oil is also related to the quality of the oil filter, the air filter and the replacement cycle, if the air filter is of poor quality or not replaced in time, dust and impurities enter the cylinder and adhere to the cylinder wall and then mix into the oil to pollute the oil.

5.The blackening of the engine oil does not necessarily mean that the oil is bad, because there is a cleaning and dispersing agent in the good engine oil, which can clean and disperse the gum, paint film, carbon deposit, etc. that previously existed inside the engine, and suspend it in the new oil to make the oil more likely to be black; Poor quality or inferior oil will also appear black soon after use, because the poor quality oil has poor oxidation resistance and high temperature resistance, and the oil is easy to deteriorate.

6.Therefore, we are reminded that when choosing engine oil, we must pay attention to choosing products with trustworthy quality or well-known brands of engine oil, so that there is a certain guarantee and can be used with confidence.

So the content of this issue is, "The engine oil that I just changed turned black soon after, is there a problem with the engine oil?" "Yes. The mechanic told the truth!

Let's take a look! When it comes to car maintenance, I believe that many people attach great importance to car maintenance and can change the oil in time even if they change the oil. We all know that the oil that comes out of the car is black.

This is normal. Because friction always occurs during the operation of the car, impurities are generated, causing the oil to turn black. This is also normal, but not long after the owner changes the oil, the oil turns black.

He was worried about the quality of the engine oil. What happened? What happened?

After consulting with a car repair shop, I finally understood why. Give you a detailed explanation.

The fact that the oil turns black is not because of the oil or the car. We all know that the engine is like the heart of the car, so the presence of engine oil is like the blood that powers the engine. Not only does it provide good lubrication to the engine, but it also runs smoothly.

Some of the carbon deposits and other oxides or impurities inside the engine can make the engine run healthier, the department said. After the engine has been running for a while, the oil turns black when it reacts with the oxide. This is normal and is not caused by an engine problem or an oil problem.

If the designed oil is still transparent after driving hundreds of kilometers after an oil change, you can only suspect that it is an oil problem. Because under normal conditions, if the car travels about 500 km, the oil will turn black. If you buy it, it will turn black.

It's definitely a matter of the oil.

However, I would like to remind all car owners that the timing of the oil change is also different. Not all the oil is changed every 5000 km. The one mentioned here is mineral oil.

Synthetic oil is changed approximately every 10,000 km, and fully synthetic oil is changed every 15,000 km. Of course, this replacement time is approximate, so you need to change it according to your car. If your car doesn't drive often, you don't have to change cars so often.