Does the oil turn black means that the oil has deteriorated?

Normally, when the car oil is just changed, it will be golden yellow, but after a certain period of use, the color will turn black. Although the color turns black, it does not mean that it has deteriorated. Under normal circumstances, as long as the use is not fake, no matter what brand of engine oil is used, its service life can be maintained at more than 5000 kilometers, and the oil needs to be changed only at 7000 kilometers - 8000 kilometers.

Only when the owner maintains bad driving habits for a long time, such as frequent sudden braking, excessive refueling, and the speed is more than 3000 rpm, the oil replacement cycle will be advanced. An experienced technician will use the viscosity of the oil to determine if it needs to be replaced, rather than observing a darker color of the oil and deciding that it needs to be replaced. In addition to understanding the common sense of this aspect, it is recommended to find those large car beauty shops to change the oil, regular stores, every time the oil is changed, it will leave a replacement record, and remind the owner of the next time to change the oil.

Why does engine oil turn oily? In automobile engines, whether gasoline or diesel, incomplete combustion can occur for various reasons. The sludge in the oil pan of the gasoline engine is mainly caused by the incomplete combustion of the car when the car stops and starts, and the horsepower is not fully utilized.

Studies have shown that these sludges are mainly from gasoline rather than from lubricating oils, and that the higher the olefin content in gasoline, the more sludge will be. In the case of diesel engines, both the driving conditions and the quality of the fuel can cause the formation of soot in the form of carbon black. The high sulphur content and olefin content of diesel fuel will cause high soot content and make the existing black quickly.

Therefore, there are several 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.

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".

After running for an hour, you will find that the oil has turned black, which has nothing to do with the quality of the oil. If it is a car that burns natural gas, the general engine oil is still very transparent even if it runs 10,000 kilometers, but we should change it or change it, so black or not black cannot be used as a standard for whether the quality of the oil has deteriorated. Many people are confused about changing the oil, some people say that the oil should be changed when it is black, some people say that 5000 kilometers is the best to replace, and some people say that 20000 kilometers is okay without changing the oil, and I don't know who said it is more reliable, in fact, the oil should not be changed has little to do with the color, or it is clear and clear.

I was very surprised and told him to change the oil quickly.

He was puzzled and asked why such a good engine oil should be replaced. I told him directly that such oil is not good, but bad, very bad, and long-term use is very harmful to the engine. Because of the mechanical movement of the metal contact surface, many fine metal particles are produced by wear.

Although this wear will be greatly reduced due to the lubricating effect of organic oil, it is not completely **. These metal particles will be mixed into the engine oil with the flow of the engine oil, which will become impurities in the engine oil, affect the purity of the engine oil, and also make the engine oil discolored.

Your lubricating oil has reached the number of kilometers of oil change or the time to change the oil, whichever comes first and which one prevails. Depending on the type of lubricating oil you add, that is, mineral oil, semi-synthetic oil, and fully synthetic oil, there is a corresponding number of oil change kilometers or time, if it is time to change the oil, then change the oil. Then congratulations, you're ready to change the oil.

If it doesn't take long and it gets dark, then did you change the fake oil, if yes, go get a new one, if not, I suggest you drive to the garage first to see if it's an engine problem. Hope it helps.

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.

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.

Changing the oil according to the maintenance interval, choosing a higher quality oil, and cleaning the lubrication system regularly can effectively alleviate the blackening of the oil.

No, in fact, there are many kinds of blackening, not necessarily deterioration, nor necessarily replacement, or according to the condition of the oil.

No, the blackening of the oil just means that your oil has been used for too long and there is already dirt in it. You don't need to replace it immediately after it turns black.

When the engine oil turns black, it has deteriorated after being used for too long, and it needs to be replaced quickly.

Yes, and then you can tell that the oil has expired, and it will also affect the performance and function of the oil.

After running for a few hours, you will find that the oil has already turned black, which has nothing to do with the quality of the finished oil. If it is a gas-burning vehicle, even if the general engine oil runs 10,000 kilometers and is released or is very transparent, but everyone has to change or have to change it, so black and not black can not be used as a specification for whether the quality of refined oil is mildew. Many people are very at a loss to change the oil, some people say that the oil needs to be changed when it is black, some people say that 5000 kilometers is the best, and some people say that 20000 kilometers is okay without changing the oil, and I don't know why it is very reliable, in fact, the oil should not be changed and the color has little to do with it, or it is clear and clear.

He was very surprised and told him to change the oil quickly.

For you to propose, mineral oil 4500 can be looked up and down, half generation 7000, full generation 9000. In short, I'm a full generation, and every time I run above 10,000 and then change, it doesn't work as a problem.

He was puzzled and asked why such a good engine oil should be replaced. I immediately told him that that kind of oil is not good, but not very good, very bad, and long-term application is particularly bad for car engines. Due to the molecular thermal movement of the metal surface, many fine metal particles can be damaged.

Although this type of damage can be greatly reduced due to the smoothing effect of organic oils, it cannot be completely eliminated. This kind of metal particles will seep into the engine oil along with the fluidity of the engine oil, and become the residue in the engine oil, which will endanger the purity of the engine oil and also make the oil fade.

The number of kilometers of your grease has reached or the time it takes to change the oil, whichever goes first and which one is the standard. Depending on the type of grease you add, it is mineral oil, semi-synthetic oil, and fully synthetic oil, and there is a relative number of kilometers or time for oil change. So congratulations on being able to change the oil.

If it doesn't take long and it gets dark, then you have changed the fake oil, if you are going to change a new one, if not, I suggest that you drive back to the garage to see if the car engine is a problem. Looking forward to helping you.

This is not the case, because the mileage is relatively long, there may be gas leakage, or it may be contact with water or air, at this time, the specific problem should be analyzed.

When the engine oil turns black, it may be that it has deteriorated, and it is indeed necessary to change the oil immediately after it turns black, otherwise there may be problems with the temperament.

Turning black engine oil is not necessarily spoiled, and many engine oils will turn black after a few hours of running the car, so there is no need to change the oil immediately after turning black.

When the engine oil has just been changed, it is yellow and semi-transparent. Typically, it is supplied with a clean dispersant. The aim is to clean the paint film and black carbon deposited on the piston and disperse it in the oil, reducing the formation of high-temperature deposits in the engine, the more dispersants, the better the dispersion, and the less paint film will be.

Yes, but there is a greater chance that the oil will turn black. As a result, some oils with strong cleaning power are cleaner than others. Weak engine oil blackens faster.

Whether the lubricating oil in use is seriously deteriorated needs to be replaced. No darkening of the oil was observed, so it was determined that it needed to be replaced.

What causes the oil to darken together?

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 stopped by the car.

The horsepower was not fully utilized, and the combustion did not quite occur. The diesel engine does not burn completely to form soot, which causes the oil to change easily. 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.Change the oil without cleaning the engine or change the oil filter. When new oil is added, the new oil is contaminated with clean waste oil, and the cleaning function of the new oil removes the original glue, carbon deposits, sludge from the engine. Once mixed, mix it into the oil to make it black.

Slightly darkened. The normal color of the oil should be yellow or golden yellow, and when it is used for a while, there will be a slight darkening, which is normal.

There are many blackened parts.

When there are more blackened parts of the oil, there are two reasons that can cause this situation:1It may be caused by inferior motor oil; 2.If it is caused by wrong driving habits (such as sudden braking, low-speed turning, etc.), choose to change the engine oil or correct the driving habits after distinguishing the situation.

Deep: blackened. Do I have to change the oil if the oil turns dark deeply? In fact, the specific situation should be analyzed specifically, some high-grade engine oil in order to prevent sludge or soot from forming paint film on the cylinder, so the more oil dispersant, the better the dispersion, the less the paint film will be, but the oil is more likely to turn black, then there is no need to change the oil.