Is it normal for synthetic motor oil to darken early

This is normal. All parts of the car are lubricated, the run-in is mainly to reduce the gap between the engine cylinder pad and the shaft wall, the machined workpiece is affected by the accuracy of the mechanical equipment of the manufacturer, the workpiece has roughness, but the advanced equipment processing is more accurate, so the car always has wear and tear in the piston ring and other places. In addition, the lubricating oil has to flow through the lubrication system of the new car, and it is inevitable that there are impurities such as dust in the lubrication system.

I won't say much about other effects of oil blackening, such as fuel factors.

Hello, during the use of engine oil, it is normal to have some blackening. If my answer is helpful to you, please set it to.

As long as the shelf life of the first engine oil is at least 3 years, 5 years will not say that there is blackening, and the oil of the national standard will run 7 8 thousand kilometers after the car is replaced, and it will not be said that it is blackened in advance, and it can be said that it is all processed by the best waste oil.

First, the oil lubricates and cleans the engine when washing off the dirt such as carbon deposits, and the second is that the high temperature of the engine makes the oil and the impurities cleaned down black, which is analogous to frying things with edible oil, and the color of the oil is getting darker and darker.

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".

It is normal for the oil to turn black in the engine.

When the car oil is just changed, it is golden yellow, but after a certain period of use, the color will turn black. Just because the color turns black doesn't mean it's spoiled.

Engine oil has its own cleaning effect, cleaning the inside of the engine from carbon deposits and oxides, and dissolving it. The black substances in engine oil are carbon deposits inside the engine and oxides inside the engine. No matter how translucent the engine oil is, as long as it is added to the engine to work for a period of time, it will turn black, which is the oil playing its cleaning role, if it does not turn black, it will not be normal.

Blackening means that the oil has cleaned off the carbon deposits and impurities in the engine, if it is particularly black, it is recommended to replace, if there is a peculiar smell, it is recommended to replace, rub it on your hands, and it is recommended to replace it if it feels obviously rough.

Black is a sign, but it doesn't mean that it's absolutely not good if it's black, touch it with your hands, whether it's sticky, or pour it into the bottle, will it pull a long oil line. If you can't do it, or if it feels like water, you can't.

Hello, that's not how you look at it. The oil is generally changed by looking at the number of kilometers or time. The oil turns dark brown (like black) because the oil has to withstand high temperatures, and the parts are squeezed, taking away the dirt inside the engine, and the oil may change color after a few hours at this stage.

If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The decay of engine oil has a certain period of time, and the "ordinary" generally begins to oxidize after about 3 months of exposure to the air, and its function is reduced. In other words, if you don't drive there for 3 months after changing the oil, you should also change the oil again. Synthesis is about half a year or 9 months.

If you drive, the country generally begins to decay at 5,000 kilometers. Semi-synthetic is generally around 7,500, and full synthetic is generally around 10,000 km. Motor oil is not based on color and viscosity.

It is best to maintain it on time [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

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 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 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.

Judging the quality of engine oil in driving is not judged by the speed of blackening, but by the oil change index of internal combustion engine oil. China's national standards are GB T7607-95 and GB T8028-94, the main indicators are viscosity growth, acid value, base number, wear, etc., and the color has never been used as an index.

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The sludge in the engine is caused by the sludge in the engine for a long time, which is a normal phenomenon, and the inside of the engine is cleaned regularly.

The simple explanation is that because the "garbage" inside the engine is cleaned by the new oil, the oil will turn black.

Whether the oil needs to be changed or not is not judged by the color of the oil, but by the time. It's time to replace it. If not, even if the oil is black, it doesn't necessarily need to be replaced.

Most oils turn black as soon as they are changed. Because engine oil not only has the function of lubricating and dissipating heat, but also has the function of cleaning.

And you can't put the oil in at all. There will definitely be residues. When new oil is mixed with residual oil, it can also turn black.

Is it necessary to change the oil for a new one? This is obviously impossible.

In most cases, synthetic motor oil should be changed every 1 year or 10,000 km. Semi-synthetic engine oil should be changed every 8 months or 7500 km; The mineral oil of the engine should be replaced every six months or 5000 km.

What is said above is not fixed. In reality, it must be flexibly analyzed according to the actual situation. If the driving environment is very harsh, it is necessary to shorten the maintenance time.

If mineral oil is used, the number of trips in half a year is very small. When you change the oil, you find that the oil is not black, so you must change it immediately. Over time, the oak will deteriorate after the oxidation of the oil, and the various effects of the oil will be greatly reduced.

Alright, that's the end of my introductory letter. Do you know if the oil has turned black and should be replaced immediately? Hope it helps.

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<> "Is it necessary to replace the blackened engine oil?"

At present, there are many types of engine oil on the market, including mineral oil, semi-synthetic oil, synthetic oil, etc. But no matter what kind of engine oil has its own replacement cycle, then, should the oil be changed when it turns black?

The oil does not necessarily need to be replaced if it is blackened, whether the oil needs to be replaced, not according to the color of the oil, but according to the mileage of the car, it is changed regularly, of course, if the oil is not only very black, but also the texture is very thin, it means that the oil needs to be replaced.

Most of the engine oil, just after changing, will have the phenomenon of blackening. Because the high mold oil not only has the role of lubrication and heat dissipation, but also the role of cleaning.

In addition, it is impossible to put no oil at all, and there will definitely be residues. New oil can also turn black when mixed with residual oil.

If the owner uses mineral engine oil, generally half a year or about 5000 kilometers of the vehicle, the oil can be changed once. If the owner uses semi-synthetic engine oil, 7-8 months or the vehicle uses about 7,500 kilometers, you can change the engine oil once, if the owner uses fully synthetic engine oil, 1 year or the vehicle uses about 10,000 kilometers, you can change the engine oil once.