May I ask my friends, why does the car engine lubricant turn black after a period of use?

Therefore there are the following reasons why the oil turns black:

a. Fuel quality, the higher the olefin content in the fuel, the higher the sulfur content, the easy formation of oil sludge in the gasoline engine, and the formation of soot in the diesel engine, and the easier it is to turn black in the engine oil.

b. The engine structure and working conditions are different, such as start-stop-stop, it is easy to make the gasoline engine generate sludge, and the diesel engine is not completely burned to form soot, which causes the oil to turn black.

c. The sludge produced by the blackening of the engine oil is also related to the long-term overload and high-temperature operation of the engine, the residue of the engine and oil pan when changing the oil, and the filtration performance of the oil filter.

In order to prevent sludge and soot from forming a varnish on the cylinder, a dispersant is added to the oil. The more dispersants, the better the dispersion, the less the paint film, but the more easy it is for the oil to turn black. As a result, some oils with strong cleaning ability tend to turn black faster than others with weaker cleaning ability.

Therefore, the blackening of the engine oil cannot be an indicator of the quality of the engine oil.

Because the engine is running and wears out, iron will be produced, so it will turn black over time.

That's because the oil is blackened by normal wear and tear, and there are stale deposits in the body.

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".

The oil is black, check if the engine is faulty. Engine oil is indispensable for machine lubrication, especially for the engine. Too much or too little is not good, generally the highest liquid level is a little lower, and it is necessary to check regularly.

Before the inspection, the vehicle should be parked on the horizontal plane, and the engine should be started to idle for 5 mis "minutes";

Stop the engine, wait for 3 mis, pull out the oil dipstick and wipe it clean, reinsert the dipstick and take it out again, and record the oil level on the dipstick;

The correct oil level should be between the highest and lowest positions;

Beat the oil on the dipstick with your hand and check its viscosity to see if there is any gasoline smell and bubbles;

When the height of the oil level is too high, even if the reason is inquired, it should be ruled out, and the reason may be caused by cooling water or gasoline stuffing into the crankcase.

Five misunderstandings about the use of automobile engine oil:

Myth 1: Engine oil is often added but not changed.

For some German oil-burning car owners, it is not wrong to check the engine oil frequently, but only replenishing and not replacing 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 engine oil, the performance will gradually decrease due to pollution, oxidation and other reasons, and there will also be some consumption, so that the quantity will be reduced.

Myth 2: The role of engine oil additives is large.

A good quality oil is a finished product with a variety of engine protection functions, and the formula already contains a variety of additives, including anti-wear agents, and the oil is most important to balance the formula to ensure that the performance is fully realized. Adding other additives by yourself not only does not bring additional protection to the vehicle, but also makes it easy for the bend to react with the chemicals in the oil, resulting in a decrease in the overall performance of the oil.

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

There is some carbon buildup inside the engine.

And oil sludge is also normal, the oil has a cleaning effect, the oil can clean off a part of the carbon deposits and sludge.

If you want to completely remove carbon deposits, you need to use the nuclear peach 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 wide and medium 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 maintain it regularly and change the oil regularly, otherwise it will affect the normal operation of the starter.

It is better to be yellow, because this means that there is no problem with the oil, and secondly, it also means that the car is better and will not have any effect.

Black is better because black is worn out, and black oil can protect car parts. Because the black oil can make the car wear and tear less.

It is normal for the oil to turn black after a period of use. Engine oil is something that every car owner comes into contact with when they are using their car. If there is no oil in the engine, the engine will not function properly.

Engine oil not only plays the role of lubrication in the engine, but also plays the role of cleaning, sealing, buffering, rust prevention and heat dissipation.

When the engine is running, the oil can form a layer of oil film on the surface of each part of the engine, which can prevent friction caused by direct contact between the parts of the engine.

If the parts within the engine are in direct contact and cause friction, it will increase the wear of the engine and the engine will overheat.

The performance of the engine oil will be reduced after a long period of use, so it is necessary to change the oil regularly.

It is recommended that you change the oil regularly when you are using the car, and change the oil filter with each oil change.

The oil filter element is used to filter the oil. If there is no oil filter, the oil will become dirty after a period of use, affecting the lubrication and heat dissipation of the engine.

When buying engine oil and oil filter cartridges, you must choose a big brand, and you must buy it from regular channels.

When maintaining your car, you must use ** accessories and oil. Don't be greedy for cheap use of some inferior parts and engine oil, which is harmful to the car.

Millions of car purchase subsidies.

<> "Why does engine oil turn black after a period of use?"

Owners who often drive will find that after using the oil for a period of time, when they check the oil, they feel that the color turns black, and many car owners will think that there is a problem with the oil itself, and the blackening means that the oil has deteriorated, and some people will directly replace it, which actually causes unnecessary waste. In this issue, I would like to tell you why the engine oil that has been used for a period of time turns black, and will it affect the vehicle?

In fact, whether it is a gasoline engine or a diesel engine, in the process of engine operation, it will cause incomplete combustion due to some reasons. For example, the oil sludge in the oil pan is due to driving in the urban area, the traffic congestion during the rush hour, and the car stops and goes, resulting in the gasoline not being fully burned, and the oil sludge is mainly the gasoline is not the engine oil.

Normally, when we change the oil, the oil is a yellow and transparent liquid. Since the oil is added with a detergent, the main purpose is to clean off the impurities and carbon deposits that adhere to the piston and reduce the formation of high-temperature deposits in the engine. The cleaned impurities and carbon deposits will be dispersed in the oil, and the better the oil, the more dispersants, the stronger the dispersion performance, so that the oil is also easy to turn black.

Therefore, color blackening is not the standard for judging oil deterioration and replacement, so what are the reasons for oil blackening? Let's find out together.

First, the quality of fuel.

A very important reason is the quality of the fuel, if the olefin and sulfur content in the fuel is higher, it is easy to produce sludge for gasoline oil, and it is easy to form soot for diesel engines, and the production of these substances will make the oil black. Therefore, we still have to control the fuel every day, and we should go to the regular refueling station to refuel.

Second, the structure and working conditions of the engine are different.

The main reason for the sludge produced by the steam engine oil engine is that the vehicle is always in a stop-and-go state, the fuel is not fully combusted, the carbon deposit increases, and the oil sludge is withered; Diesel engines are incompletely burned to produce soot, which will further cause the oil to turn black.

3. The engine is overloaded for a long time.

Often running at high speeds or driving distances, the engine is in a state of overload for a long time, coupled with high temperature weather, the oil will oxidize and turn black in advance.

Fourth, when changing the oil, the waste oil is not drained cleanly.

Fifth, when we change the engine oil, it is impossible to completely discharge the waste engine oil, and the newly added detergent of the engine oil will play a role in cleaning the original gum, carbon deposit, oil sludge and other impurities, and mixing them into the engine oil, which will also cause the oil to turn black.

To sum up, the blackening of the engine oil does not mean that the oil has deteriorated, as long as we buy the branded engine oil in the regular channels, and do regular maintenance and maintenance, it will not affect our vehicles.

It is normal for the oil to be blackened after a period of use, and 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 each component in the engine can also reduce the resistance to movement between the various components, which can be used to make the engine run more smoothly.

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

Engine oil is the blood of an engine, without oil, the engine can not run normally, which shows the importance of engine oil to the car. So every time you need to change the oil, I don't know if you have noticed, every time the oil is changed out is very black, is it every time the oil turns black, it means that it needs to be replaced?

In fact, this situation is completely normal, and it turns black after only a few hundred kilometers, mainly because the original engine oil is not cleaned. The oil is not clean anyway, there will be organic oil residues on the oil channel wall and the hydraulic tappet, and when the new oil is added, the oil will be mixed with the old oil taken by the original limb after circulation, and the whole will turn black. In fact, when a new oil is mixed with a small amount of black oil, the whole will turn black, just like a few drops of ink into a basin of water, and the whole basin will turn black.

Although the engine oil looks black when it cracks, its performance is not affected, and its quality cannot be judged by whether the oil is black or not.

The main role of motor oil.

It can lubricate and reduce friction, assist cooling and cooling, seal leakage, rust and corrosion, shock absorption and cushioning of the engine.

However, changing the engine oil is also a common car maintenance.

Some riders may wonder why the engine oil turns black after a long time. Is the oil unqualified, or is it not clean?

Actually, it's neither, it's right that the freshly changed engine oil turns black. If it doesn't go black, it's proof that your oil isn't working properly. There are two main reasons why engine oil turns black: one is for cleaning, and the other is for oxidation.