Is it fake that the oil you bought has no date

Hello, normal engine oil has a production date.

Many car owners do not know about the above information, the quality of the engine oil determines the length of the engine life of our car, and it is very likely to be related to the survival of the engine. The following is a brief introduction to several methods that are easy to judge the quality of engine oil.

Hand twisting method will be the lubricating oil twisted between the thumb and index finger repeated grinding, better lubricating oil hand induction lubrication, less abrasion, no friction, if the induction between the fingers of the sand particles and other greater friction, then the lubricating oil impurities are more, should be replaced with new lubricating oil.

On a clear day, use a screwdriver to lift the lubricating oil at an angle of 45 degrees. Compare the sunlight, observe the oil droplets, under the light, you can clearly see that the lubricating oil has no abrasive debris is superior, can continue to work, if the abrasive debris is excessive, the lubricating oil should be replaced.

After the lubricating oil leaks, if there is black powder on the surface, there is a sense of astringency when touched by hand, it means that there are a lot of impurities in the lubricating oil, and there is no powder in the good lubricating oil, and it is dry and smooth to the touch, and it is yellow.

Many car owners believe that as long as the car is not driven, the quality of the engine oil will not change. Actually, no, after the oil is poured into the engine for a period of time, the oil will deteriorate due to the purification of mechanical impurities and dust from the outside world, the metal chips worn by the rotating parts and the metal salts formed by the erosion of the parts.

In addition, it should be noted here that the engine oil will show a dark black, foamy and emulsified after deterioration, grinding with fingers, no viscousness, astringency or peculiar smell, and dropping on the white test paper to show dark brown, no yellow infiltration area or many black spots. If it is not replaced in time, it will not only accelerate the wear and tear of parts, affect the service life, and even cause safety chaos.

The easiest way to check the shelf life of motor oil is to observe whether the viscosity of the oil has changed, whether the smell of the oil has become lighter, and whether the color of the oil has changed. Among them, when observing the color change of the engine oil, it is necessary to pay attention to the changes in the additives in the engine oil. In addition, it is possible to check whether the shelf life of the car oil has expired by means of filter paper or electronic instruments.

By observing the color of the engine oil, the high-quality engine oil is translucent yellow-brown, the oil is brown with water, and when the engine has been running for a while, the oil is milky white with foam.

Looking at the color of the engine oil, the engine oil under normal conditions should be clear, or with some manufacturers of the color. If the existing oxidation deteriorates, the oil that appears to the naked eye will become cloudy and lose its transparency.

If you sense a large friction sensation such as sand between your fingers, there are many impurities in the lubricating oil.

You can compare the oil to the sunlight to observe the oil droplets of the oil, and you can also see the color of the oil.

It can be distinguished by the color, smell, and viscosity of the oil.

By looking at the viscosity of the oil, the color, and so on.

Observe its color, viscosity, and smell.

See if the color is normal, see if there is sediment in the oil or something.

Generally speaking, engine oil is biased towards alkaline, and the total base number of engine oil can indirectly reflect the composition of the detergent and dispersant contained in the engine oil, due to the sulfur dioxide in gasoline.

and water to form sulfurous acid.

The alkaline substances in the engine oil will neutralize these acidic substances, the oil is generally about 3 years, but there is no problem with the oil for a few more years, it will not deteriorate, the oil is added to the engine, it is to play the role of lubrication, anti-corrosion, cleaning, and the oil blackening is caused by impurities in the air.

<> generally have at least three years, because the oil is not food or medicine, so the expiration date is generally not marked, the oil is stored indoors without damage to the package, at least 5 years can be guaranteed, and the synthetic oil is longer. Why is the shelf life not marked with the machine leakage wax oil?

Don't say this topic so absolutely, it can only be said that Zheng Bang's individual engine oil is not marked with the expiration date, and most engine oils are still marked, and the shelf life is generally five years.

Many motor oil packages only have a manufacturing date and no expiration date, which is really confusing. Motor oil due to its chemical properties.

It is relatively stable, so the shelf life of unopened is actually very long. If you think about how stable it can be for a year to work in a hot engine compartment. In order to ensure the performance of lubricating oil, it is generally required to be stored in a cool and dry place to prevent water and other impurities from entering foreign matter.

If the storage time is more than four or five years or even longer, pay attention to whether the smell of the oil is abnormal and whether there is sediment when opening the lid and using it.

There is no problem with this use to 10 years, because the shelf life of the oil is very long, and even 15 years will not affect the use, but generally people will not do this, my previous oil has been put for 78 years, there is no problem with normal use, and the quality of the oil is very good for customers, this behavior is not advisable, the oil will enter the moisture after opening, and the additives in the oil will be damaged, accelerating the oxidation of the oil. Some corrosive substances are generated, and when there is too much moisture in the oil, the lubricity of the oil decreases.

Generally, there is no problem with the engine oil for a year or two, because the engine oil on the market is now turned on. It is poured directly on the engine cracking machine or slag, so there is no need to mark the expiration date.

No, engine oil also has a shelf life, but engine oil is a consumable and consumes relatively quickly, so it is generally not specially labeled.

Generally, it does not expire, and people will slowly use up the engine oil when driving, so the shelf life of the engine oil is actually very long.

If you don't write the expiration date, you shouldn't have to worry about expiration, and the general engine oil is written for three years, and it has a shelf life.

No. Engine oil also has an expiration date, but the shelf life is very long, and it can generally be used up before it expires.

No, the shelf life is long, and the general engine oil is used relatively quickly, and it has been used up before the expiration date.

Introduction: Motor oils do not have an expiration date.

Why is that? Because the characteristics of the use of motor oil and the shelf life in different use environments vary greatly. In general, the shelf life of the oil is about 5 years when it is unopened, but if the oil drum is opened, the shelf life will be reduced to two years when exposed to air.

Oil added to the engine usually has a shelf life of only 8-10 months. This is because exhaust gases from the engine combustion chamber pollute the oil.

1. Why does engine oil have an expiration date?

In fact, the main reason why motor oil has an expiration date is because of the expiration date of motor oil additives. In general, various additives need to be added to the engine oil to ensure the condition of the oil and maintain good dosing fluidity and lubricity, such as to avoid the oil being emulsified.

It is necessary to add a waterproofing agent to the oil, and in order to increase the fluidity of the oil, it is necessary to add an anti-condensant agent to the oil. In the normal use of engine oil, additives are consumed, such as oil waterproofing agent, which will be consumed according to the amount of water in the oil, once the oil waterproofing agent is exhausted, the oil will be and water vapor.

At high speed stirring they all fuse with each other to form an emulsion, which is the emulsification of motor oil.

Second, the role of engine oil.

The importance of engine oil to the engine is too great, the oil is called the blood of the engine, playing the role of lubricating the engine, the engine without oil will be damaged after a minute of operation, in addition to lubrication, the muscles also have the role of cleaning and heat dissipation, sealing, rust prevention and shock absorption.

3. Preservation of engine oil.

The remaining engine oil after opening is mainly to --- to isolate the air, simply tightening the bottle cap can not effectively isolate the air early, but also need to add a layer of plastic film, with the usual fresh-keeping bag, garbage bags can be, the air is easy to enter from the bottle mouth, we cover the bottle mouth with plastic film and tighten it, and then place it in the corner of the house and other shade, dry place can be, the oil is easy to be channeled into impurities or air to cause deterioration, or even failure, As long as you pay attention to the storage method, the remaining engine oil can be stored for a long time, and you can use it at any time when you need to use the old sparrow.

Because the engine oil can be kept for a long time as long as it is preserved, and because the engine oil is very stable, it is not very important to have a shelf life, and the national policy is not mandatory, so the oil bulk is generally not marked with the expiration date.

This is because the expiration date will not be marked on the engine oil, but there will be some symbols to remind that the shelf life of unopened return engine oil is 5 years, and the shelf life of different open engine oils is different.

This is because the shelf life of the oil is very long when it is not opened, so there is no expiration date.

The field of auto oil sales is awkward, and there are some unreasonable problems. That is, approachingShelf life, the selling price will be adjusted. However, unopened finished motor oil theoretically has no expiration date!

This review can be mistaken for a salesperson, but we don't sell auto parts on any online platform. So it is possible to discuss this issue absolutely objectively. So, how do we conclude that motor oil has no expiration date?

Generally, there are at least three years, and the long time is about twelve or thirteen years. Because oil is not a food or a medicine, it is generally not marked with an expiration date.

If the oil is stored indoors without damaging the packaging, it is guaranteed for at least five years. Synthetic motor oil is longer. If you are using imported oil, you will not find the expiration date on the packaging and stickers.

At most, there will be a lot number and a date of manufacture. Many consumers thought they had bought fake oil, but after verifying it through various methods, they found that it was. There is no expiration date because there is no mandatory labeling, but there is no need to specify the expiration date in other fields, and the peculiarity of the oil can be seen in the lap training.

Engine oil has an expiration date. Motor oil (fully synthetic, semi-synthetic, mineral oil.

The shelf life is generally 4-5 years.

Contamination and deterioration of motor oil during storage is mainly caused by the contact of motor oil with moisture, oxygen, and impurities in the air. Therefore, the oil that has been opened must be kept tightly sealed. In general, the airtight storage period of motor oil after use varies depending on the type:

Mineral oil storage for 6 months is not a big problem; semi-synthetic ones can be stored for 9 months; They can all be kept for 12 months or even longer. No matter what type of oil, this time is enough to support the next maintenance of the car. Engine oil has an expiration date.

The shelf life of motor oils (fully synthetic, semi-synthetic, mineral oil) is generally 4-5 years. Contamination and deterioration of motor oil during storage is mainly caused by the contact of motor oil with moisture, oxygen, and impurities in the air. Therefore, the oil that has been opened must be kept tightly sealed.

Generally speaking, the sealed storage period of motor oil after use varies depending on the type: mineral oil is stored for 6 months, and it is not a big problem to ask questions; semi-synthetic ones can be stored for 9 months; They can all be kept for 12 months or even longer. No matter what type of oil, this time is enough to support the next maintenance of the car.

Because this criterion is not fixed, sometimes it is also related to the performance of the oil, and it is also related to the way it is stored.

Because most people will seal and isolate the air when storing the oil, and then the oil is used relatively quickly, there is no need to mark the expiration date.

It's because each type of oil is stored differently, and people use it very quickly, so they don't need to be labeled.

About 3-6 months.

In addition, if you want to distinguish between real and fake engine oil, you can look at the packaging, the packaging of real engine oil is very neat, there is no stubble, and the color of the packaging box is bright, while the outer packaging of fake engine oil is rough and dull in color; At the same time, many real engine oil packaging will have the special mark of the corresponding manufacturer, when buying engine oil - must be carefully checked, some engine oil can be checked on the official website anti-counterfeiting code.

It is difficult to judge the authenticity of the engine oil, and it is not necessarily possible to determine how long the fake engine oil will be used to cause problems, some may have problems soon, and some may be fine until the next oil change.

There are often a lot of fake engine oil on the market, and many car owners often can't tell the difference and buy fake engine oil to use. As for how long it takes to know how long the fake engine oil is generally used, it is difficult to determine. Some people who use fake oil may have problems with their car quickly, while others may not be able to change the oil until the next time.

Fake engine oil can have many undesirable effects on the car: the car's fuel consumption increases, and the engine does not burst out with optimal power. The engine is noisy and the service life of the engine is greatly reduced. The oil temperature is prone to get too high, and the pressure fault light is always on.

Distinguish between real and fake engine oil

Don't use the engine oil directly, the engine oil also has good quality, there are ** engine oil and fake engine oil. The best thing is to go to a reliable store with an authorized ** book to buy engine oil; Then you can look at the packaging of the engine oil, the real oil packaging is usually neatly made, the sealing cap is usually a disposable cap, and there is a sealing tin foil at the notch, while the fake engine oil is rough and dull in color.

The last is to look at the appearance of the oil, the color of the oil is often much darker than the fake oil, and the real oil has no impurities, no suspension, no sediment, light and transparent color, and better fluidity.