Oil in the air filter: why it gets in and what to do. Because of what it can drive car oil through the breather

Car engine of any kind has a complex design. It includes various systems and mechanisms that interact with each other. To ensure the removal of gases formed in the internal cavities power unit, diesel engine equipped effective system ventilation.

Blow-by gas formation

In the process of combustion of working mixtures in the engine cylinders, an accumulation of high-pressure exhaust gases occurs. Due to the pressure, some of the gases seep into the crankcase. There they are mixed with oil vapors and condensate moisture. The resulting gas mixture is called blow-by gases.

With increasing pressure, the gas mixture breaks through the following elements:

oil seals;
breather;
oil dipstick outlet;
seals.

If a characteristic effect called "drives oil" appears, it means that when gases are released, an entrainment occurs. engine oil... To stop the moving oil from the breather diesel engine, it is necessary to maintain the pressure inside the engine within the permissible limits by removing the crankcase gases through the ventilation system.

The principle of operation of the engine ventilation system

In the design of older engine models internal combustion the simplest schemes of ventilation systems were built in, they included only one breather, which was located in the crankcase. It was a link connecting the inside of the cylinder block with the atmosphere, through which crankcase gases came out.

This scheme had a significant drawback: the exhaust gases contained oily particles, which were dispersed in the external environment. The negative effect led to significant losses of lubricants, and was also a serious factor polluting the atmosphere.

Modern diesel and turbo engines are equipped with closed ventilation systems. A special branch pipe is connected to the breather, through which the exhaust gases are discharged into the cavity intake manifold or to the air filter for further advancement into the cylinders to participate in the combustion process.

Advanced designs eliminate the causes of contamination the environment, do not allow oil particles to be driven into the atmosphere.

In addition to everything, each engine is equipped with special elements that separate oil particles from gases and return them to the crankcase.

Depending on the manufacturer and model of the car, there are several options for oil separation devices, which differ both in design and in the principle of operation.

The composition of the ventilation systems of diesel power units modern cars includes the following elements:

Oil separator.
Breather.
Two pipes.
Gas pressure valve.

The appearance of the systems may differ depending on the car model, but the principle of operation and purpose remain unchanged.

Description of the design of the ventilation system of the VAZ 2110 engine

The breather with the fixed end of the pipe is located at the bottom of the cylinder block. The opposite end of the branch pipe is connected to the oil separator located in the head cover of the block. On the opposite side of the head, a special tube is connected to the fitting. This tube is connected to the air inlet.

The system operation consists of the following stages:

Passage of gases into the cavity of the head cover through the diesel breather.
Separation of oil in the oil separator and its supply to the valves.
Mixing and supply of gases to the manifold through the air connection.

The power unit of this car model is not equipped with a valve that regulates the pressure of the exhaust gases.

In other vehicles, oil separators can be located in the area of the breather, behind which the pressure valve is located.

How to detect oil leakage through a diesel breather

The performance of this system is very important for the stable operation of the engine. Oil escaping through the diesel breather is the most common ventilation problem.

If this defect is untimely identified and eliminated, serious breakdowns may occur in the internal combustion engine:

the ingress of oil particles into the cylinders and the manifold;
clogging and clogging of channels;
an increase in the amount of soot during combustion;
the ingress of soot into the oil sump;
coking of oil channels;
deterioration of the lubrication system.

Signs of oil rutting through a diesel breather include the following effects:

Leakage of grease inside the air filter.
The presence of abundant oil traces on the outer surface of the filtering device of the carburetor motor.
Oil deposits on the throttle mechanism and the inner surface of the intake manifold.
Decrease in engine power indicators.
Fuel consumption growth.

What are the reasons for oil ejection

Lubricants can escape through the diesel breather, not only due to breakdowns in the ventilation system. This defect is also observed due to the following reasons:

Increased wear of piston rings, destruction of surfaces in cylinders and pistons lead to the passage of a large amount of gases into the crankcase, which ventilation is unable to cope with. This situation leads to increased pressure, at which the oil is squeezed out through the breather.
Blockages in the oil separator drain channel cause the separated oil to mix into the passing gases.
Clogged air filter. With this defect, the engine does not have enough air, and it begins to use air masses from the ventilation, contaminated with oil inclusions.
An increased amount of engine oil in the lubrication system will lead to excess entering the ventilation system.
Failure, bedding of the ventilation valve.
The wear of the gas distribution mechanism and the burnout of the valve entail the ingress of crankcase gases into the space above the valve and into the crankcase, which contributes to an increase in pressure in the engine.

Diagnostics of the release of lubricant

To identify the causes of a defect in the rut of lubrication through the breather of a diesel engine and a turbo diesel, it is necessary to conduct a comprehensive check of the power unit. This does not require disassembly of the engine. Experienced craftsmen measure certain parameters and visually assess the state of the elements included in the ventilation system.

When plaque and oil deposits are detected in the intake manifold, it is concluded that there is a release of lubricant through the diesel breather seals. To carry out diagnostics, you will need a set of tools consisting of open-end wrenches, screwdrivers, and a compression meter.

Algorithm of verification activities:

Condition analysis exhaust gases... This starts the engine and checks the color tone of the exhaust. A black or gray tint indicates that oil enters the cylinders, since there is wear and tear on the oil scraper rings, and there are also problems in the operation of the gas distribution mechanism.
Compression check in each cylinder. The amount of compression, equal to 11-13 MPa, indicates the correct operation of the cylinders and pistons. The difference between the compressions in the cylinders must not exceed one megapascal. Low compression of one of the cylinders may cause an exit lubricant.
Using a glow plug, the specific cause of the defect in a given cylinder is determined. The plug is removed and checked for strong traces of carbon deposits, which indicate defects in the cylinder - piston group.
The absence of carbon deposits on the spark plug indicates that the valves need to be checked.
With normal compression in all cylinders, it is necessary to further check and clean the elements of the ventilation system. All incoming devices must be dismantled and thoroughly washed, dried, and then reinstalled.

Conclusion

The release of lubricant through the diesel breather does not immediately manifest itself. It starts with small portions, and then the amount of oil builds up. There are times when the power unit loses more than one liter lubricating fluid for a short time.

Car owners are concerned about this problem. To diagnose, clean and eliminate a system defect with your own hands, it is enough to change the brand of lubricant and clean the breather.

Owners of old domestic cars after several years of ownership, they can easily write a directory of "diseases" of a particular car model. One of these "sores" is an engine malfunction, in which the engine oil is squeezed out through the breather. This phenomenon is often called simply by the people: "drives oil through a breather" or "throws oil through a breather".

The problem is quite frustrating and comes with a lot of motor related problems. It is about this problem, as you probably already guessed, that we will talk about in this article. You will find out why it drives oil from the breather, for what reasons this happens and how to solve this problem. Go.

As a rule, the problem is relevant with the onset of cold weather, the breather freezes and the oil squeezes out. This manifests itself in the form of oil drips, which are visible from the outside of the engine. Untimely reaction to this phenomenon can lead to serious breakdowns engine.

The principle of operation of the ventilation system of crankcase gases

In order to understand why the oil squeezes out of the breather, I propose to briefly consider the principle of operation oil system... Not many people know, but for the engine to work properly, ventilation is necessary, since during its operation, gases are collected in the crankcase and now we are not talking about exhaust. To ensure the removal of these gases in old cars, the so-called crankcase ventilation system was used, which after a while began to be referred to as "breather". With the help of a breather, the engineers were able to ventilate the crankcase and thereby relieve the pressure that forms during engine operation. However, the system proved to be ineffective, since the smallest particles of oil penetrated into the breather together with excess pressure and gases.

The issue of penetration of "oil dust" into the breather was partially solved by means of a special mesh that catches oil particles and does not let them into the breather. However, despite this, some of the oil fumes still penetrate further, creating certain difficulties for the owners. A small amount of oil that has penetrated the breather is not considered anything scary, but if oil drives the breather in large quantities, this is a reason to seriously think about technical condition motor.

Reasons why it drives oil through the breather

CPG wear. With serious wear of the cylinder-piston group (CPG), in particular the rings, a certain amount of exhaust gases penetrate into the crankcase, as a result of which excessive pressure is formed and, as a result, the oil run begins. The oil squeezes out under great pressure and no mesh can save you from this.
Plugged oil deflector. In the event of a violation of ventilation, oil vapors begin to bypass the purifier, as a result of which the oil is driven out of the breather.
Clogged air filter. Clogged filter does not allow the motor to "breathe"; as a result, air is taken from alternative sources, including through the breather, only together with the oil.
... Some motorists do not comply with the requirements specified by the manufacturer and prefer to pour oil to the upper level or higher, citing the fact that there is never too much oil. As a result, the excess oil, as it should be, starts to work not in favor, but on the contrary, to the detriment, and part of this oil squeezes out through the breather, in addition, it appears on air filter.
The breather valve is out of order. A faulty or stuck valve leads to the fact that exhaust gases begin to penetrate into the crankcase, as a result, the pressure increases and oil is ejected through the breather.

Troubleshooting

The first step is to pay attention to the color of the exhaust, blue or black smoke, a sign of burnout valves or problems with the rings. More details on how to determine the malfunction by the exhaust gases.
Next, you should check the compression in all cylinders, the value on gasoline internal combustion engines should be in the range of 11-13 MPa. You can learn more about how to check the compression.
Disconnect the connections from the valve cover, air and breather. Assess the degree of contamination. If the pipes are very dirty or clogged with oil carbon, use gasoline to clean or a special carburetor cleaner.
Check the condition of the oil separator. Unscrew the required bolts to access this assembly. Take out the oil separator and assess its condition. Clean or rinse and dry if necessary.
Inspect and, if necessary, flush the breather valve. There are situations when the valve wedges, as a result of which the exhaust gases penetrate into the crankcase and create excessive pressure. Remove the part and flush, in most cases this will solve the issue of squeezing oil out of the breather.

Helpful advice! To distinguish stuck rings from a burnt-out valve, it is enough to perform several manipulations. After checking the compression in the cylinders, find the cylinder with the smallest value. Then inspect the plug of this cylinder, if the rings are buried in this cylinder, the plug will be covered with a thick layer of oil. If the valve is burnt out, the spark plug will look normal without any major abnormalities.

Finally...

The problem with the release of oil through the breather worries many motorists and gives a lot of trouble, however, with the timely detection of the problem and the right approach serious consequences can be avoided. It is important to check that the oil level is correct. As soon as you find that, monitor its level and constantly watch so that it does not fall below the acceptable level. Also pay attention to the breather and filter, oil on the air filter in large quantities also does not bode well. Regularly monitor the condition of the motor and all systems, and promptly eliminate this or that malfunction and unnecessary waste.

Motorists rarely look into the air filter and often recognize the ingress of oil particles only with a planned or emergency replacement this item. However, if oil is found in the air filter, then the owner needs to find the cause and fix the problem.

Why does oil get into the air filter

The main reasons for the ingress of liquid into the element:

When fuel is burned into the engine, it forms gases that enter the crankcase. When correct work of an automobile engine, gases escape through the cylinders and enter the external environment through the exhaust system. However, if the engine is faulty or the wear is 50-60%, the gases enter the air filter and carry oil particles with them, which settle on it.
If it is necessary to replace the piston rings, oil enters the crankcase, the ventilation duct and the air filter.
If the hose used to supply oil is clogged, it is sent to the air filter along with the gases from the crankcase.
Can get clogged and branch pipe. In this case, the oil travels with the gases from the crankcase.
A clogged filter can cause oil to spill onto it. Insufficient air enters the vehicle system, which causes malfunctions in the engine.
High engine pressure and clogged with debris exhaust system lead to the accumulation of gases in the crankcase and engine, which travel through all pipes, including into the air filter and bringing oil there.
The reason often lies in the worn out oil seals. In this case, the oil consumption for the engine increases.

How to remove oil

The main methods used to fix the problem:

More often, oil enters the filter along with the gases that pass through it. To solve this problem, you will need to remove the hose from the filter, rinse it from impurities and debris that clogged the element, and then install the hose back.
If this does not help, you will have to check throttle... Carbon deposits and debris often interfere with the correct operation of the part, which causes the engine high pressure... Most often, the problem is solved by repairing the damper or replacing it.

Slag can accumulate in the oil deflector of the vehicle; to fix the problem, you will need to clean this element and install an additional oil deflector.

If the air filter is damaged or clogged, it may itself be the cause of oil. In this case, the filter can be replaced or cleaned.

If the problem has not been resolved, then the cause will have to be looked for in the engine. This means that the car will need more serious repairs: replacement of oil scraper rings or other types of manipulations.

Oil in the air filter pipes often appears due to compression disturbed in the car's cylinders. You can check how the cylinders work by warming up the engine to working temperature... If the values are not the same, then the engine needs repair. This problem occurs especially often with old cars.

The owner will also need to check the valve clearances. If they are too large, oil will start to appear in the air filter. The same goes for the replacement of the oil seals. In a garage environment, it is difficult to determine the cause of a vehicle malfunction. Most of the owners turn to a car service, where the diagnostics are carried out by masters using special equipment.

If your machine's engine is worn out, you can postpone the overhaul as follows:

The hose that conducts gases through the crankcase must be removed.
A plug is installed on the union.
The crankcase is vented through an extended hose that is passed through the bottom of the engine.
Change the engine lubricant.

But these manipulations will delay the intervention of the repairmen by a maximum of 500 km. After that, the motor will need to be repaired or a new unit installed.

What the problem threatens

The very presence of oil on the air filter will not do harm, however, it can serve as an alarming symptom that the need is approaching. overhaul engine, and this procedure is laborious and expensive. The appearance of a symptom requires prompt contacting a car service for in-depth diagnostics of the machine.

Key features

When checking engine compression, remember that a difference of one or two units is acceptable. If the compression in the cylinders is very different from each other, then this indicates that the valves are burnt out or the rings are not pressed tightly, and it is time to change them.

It is worth paying attention to the color of the car's exhaust gases. If a piston group is badly worn, the smoke will take on a bluish tint.

If, after checking the compression in the cylinders, no serious deviations from the norm were found, then there is no cause for concern, and the oil, most likely, comes through the crankcase due to the hose clogged with debris. The hoses are easy to clean or replace.

See what to do if oil gets into the air filter

Outcome

If oil is found in the air filter, check the entire system carefully. Even if the car is new, this does not guarantee that the valves or rings are in good condition. The problem at the initial stage can be solved with a minimum cost of finance and effort, but the launched version will be very expensive to repair.

Many owners of old cars have a question: why does it drive oil through a breather? This situation requires an immediate solution, otherwise the motor may need to be repaired. If it drives oil through the breather, then this indicates the presence of certain malfunctions. Moreover, their diagnosis is rather complicated. But it can still be done on your own. This does not require special equipment and skills.

During operation, gases accumulate in the crankcase. To remove them, there is a ventilation system called a breather. This makes it possible to reduce the pressure in the motor itself. Since air masses with the smallest particles of oil are always present in the crankcase, a little grease sometimes passes into the breather along with air flows.

There is an oil trap here. But some drops still manage to penetrate. So it is normal for the filter system to get slightly dirty. But if there is too much oil, then you should think about the reasons for getting it. Particles of oil tend to clog the channels and increase the amount of soot. The latter enters the crankcase and cokes the channels through which the oil enters. As a result, the performance of the entire lubrication system will deteriorate.

If there are specific signs by which you can determine what drives oil through the breather. IN carburetor engine traces of grease may appear in the filter housing. There can also be significant traces of grease on the filter component itself.

IN injection engines deposits appear on the throttle assembly. This may cause the engine to lose its power and fuel consumption may increase.

Why is the release of grease from the breather

There are quite a few reasons why oil is thrown out of the breather, and therefore the diagnosis is so difficult.

With significant wear of the rings, gas begins to pass into the crankcase. As a result, there is high pressure there. It also begins to drive oil from the breather.
Clogged oil deflector drain. As a result of the inability to escape, air masses with oil begin to be removed not through the purifier. This reason is very common.
The air filter is clogged. As a result, the motor begins to absorb air with great power. Part of the air in this case also comes from the breather. This leads to the appearance of plaque in the filter.
Breather valve defective.
Valve problems. Exhaust gases begin to penetrate into the engine, which increases the pressure.

Diagnostics

Since there are many reasons why it drives oil through the breather, a comprehensive check of the engine will be required. To carry out such a check, you don't even need to parse power plant... It will only be necessary to measure a number of parameters and assess the state of the ventilation system.

For consideration, you can take a VAZ-2110 car. Let's say a lubricant deposit has formed in his engine. This suggests that it drives oil through the breather. To find out the cause of this problem, you will need a compression gauge, a screwdriver and a few wrenches.

Diagnostics begins with an assessment of the gases escaping through exhaust pipe... First, the engine is started and the color of the exhaust is assessed. If they have very dark color, this indicates that oil is entering the cylinders as a result of damage to the CPG rings.

It is also important to check the compression in each cylinder. If the cylinder-piston group is in normal condition, then it should be in the range of 11-13 MPa. The difference between the indicators of the cylinders should not exceed 1 MPa. If the compression in one of the cylinders is lower, then this can provoke an oil leak.

But from the valves or from the rings this problem arises, only the spark plug, which is installed on a given cylinder, will help to determine. If strong carbon deposits are present on it, then this will indicate certain problems with the CPG.

If the compression is small, and the candle has an ordinary appearance without plaque, then it is worth inspecting the valves. In a situation where compression in all cylinders normal level, it is necessary to check the ventilation system.

Checking the ventilation system

Let's consider it on the example of the VAZ-2110 car.

The pipes are disconnected from the breather, valve cover and air connection. The level of their contamination is checked. If necessary, they can be washed in gasoline and dried.
The nuts are unscrewed, after which the cover is removed. Inside it there are 2 bolts for connecting the oil separator roof, which will need to be unscrewed.
The unscrewed cover is removed, the oil separator is taken out. It is made of plates that can be easily disassembled and washed.

On other machines, the structure of the system may look different. Therefore, it will be parsed differently. But the essence of the actions will not change from this. All components will need to be removed and rinsed.

It is easy to inspect and flush the old gas release control valve. It is necessary to remove it and check the stroke of its stem. If it jams a little, then the valve just needs to be rinsed with gasoline, dried and reinstalled.

This completes the inspection and flushing of the crankcase ventilation. They are uncomplicated, so any car enthusiast can handle them. It is important to note that it is worth cleaning the ventilation system every time you change the oil.

Usually, problems with the release of oil through the breather do not appear immediately. They build up gradually. As a result, the engine can lose up to 1 liter of lubricant in a short time. At this moment, car owners begin to think about the problem of why they are driving oil from the breather. This situation is very frightening. It is aggravated by the lack of experienced diagnostic specialists in car services. Usually, car owners, after carrying out diagnostics, disassemble the power unit. But it would be enough to reduce the level of "consumables" or clean the breather.

Video: how to clean the breather with your own hands

A fairly common problem on many domestic and foreign cars is that it drives oil through the breather. IN winter period, especially with the onset of a significant cold snap, you can encounter a malfunction when the breather is frozen, oil squeezed out and streaks are visible on the outer surface of the power unit. Immediately, we note that this symptom, as well as smoke and oil from the breather, are a reason for immediate engine diagnostics, since ignoring this problem can lead to a quick and expensive engine repair.

Note that if oil is flowing through the breather, it can be difficult to diagnose the root cause. Accurately identifying the underlying problem will require skills, special equipment, etc. However, in some cases, the driver can understand why oil is running from the breather without involving outside specialists. In other words, the diagnosis is carried out independently in garage conditions... In this article, we will talk about why oil is dripping from the breather, as well as what the car owner should do if oil is thrown out through the breather.

Read in this article

Breather oil: what to do and how to find the cause

To begin with, the so-called blow-by gases accumulate in the crankcase during engine operation. In order not to create excessive pressure, there is a special valve for ventilation. This solution allows the closed casing to communicate with the atmosphere. The specified valve is the breather. In simple words, the breather is actually not needed in order to equalize the pressure inside the engine.

It should be noted that gases in the crankcase mix with oil mist. As a result, lubricant particles enter the breather. Although there is a special oil trap inside the device, a certain part of the oil can escape to the outside. Based on this information, slight contamination of the system is allowed, which is normal. In cases where a lot of grease flows out, you should separately look for why oil is thrown from the breather.

Oil leaks through the breather lead to clogging of the channels, in some cases soot is formed, etc. Excess soot gets into the engine crankcase and cokes. As a result, loaded parts are less lubricated, and engine wear is accelerated. We add that traces of oil will not necessarily be visible from the outside in the engine compartment. If leaks through the breather valve, oil in the housing or on the filter element itself is a characteristic symptom of a malfunction.

On injection engines, traces of oil entering the throttle area are noticeable, the power unit also loses its throttle response and power, and fuel consumption increases noticeably. It turns out that to check it is necessary not only to inspect the outer surfaces under the hood, but also to remove the air filter, throttle assembly, etc.

Why does oil flow out through the breather

If oil appears from the breather, there may be several reasons. Taking into account various features before self-diagnosis you need to pay attention to additional symptoms.

First of all, the oil crushes as a result of significant wear. This means that gases from the combustion chamber penetrate through the seal into the crankcase, after which too high a pressure builds up there. Excessive pressure causes oil to flow out through the breather.
One more possible reason the oil deflector drain may be clogged. In this case, gases and oil particles, which cannot pass through normally, exit through the breather and not through the purifier.
Also on the list it is worth noting a significant decrease bandwidth air filter. In this case, the engine simply does not have enough intake air. The result is the appearance of oil in the filter housing and on the filter itself.
Should not be excluded and possible problems with the breather itself. As a rule, the valve fails, the through hole in the breather is clogged, etc. Normal ventilation is disrupted, exhaust gases enter the crankcase of the internal combustion engine and build up pressure.
In some cases, it leads to the surplus flowing out through the breather. It turns out that excess oil simply presses out of the engine. In such a situation, the lubricant level should be checked and brought back to normal if problems are found.

Drives oil through a breather: diesel and gasoline internal combustion engines

Diagnostics of the engine with oil leaks through the breather assumes an integrated approach. There is no need to disassemble the power unit to check. It becomes clear that at the initial stage it is necessary to assess the condition of the breather, make sure it is working and clean the device if necessary. The oil level is also checked on the dipstick. If everything is in order with the level and there are no other additional signs of a malfunction, then it is optimal to replace the breather with a known good one.

After making sure that the breather is in good order and the ventilation is at an acceptable level, it will be necessary to make a number of measurements and assess the condition. As already mentioned, the reason may be broken rings, that is, you need to measure the compression in the engine.

Also, the need to measure the compression can be additionally indicated by the color of the exhaust gases. To check, it is enough to start the engine, and then evaluate the exhaust. If the engine is, then this may be a sign of engine oil entering the cylinders due to wear. piston rings... When checking the compression, you need to measure the readings in each individual cylinder. In the normal state of the CPG, the compression should be at around 11 MPa and above (it is recommended to familiarize yourself with the technical literature in relation to a specific type of internal combustion engine). If a run is detected according to the indications in the cylinders, the differences should not exceed 1 MPa.

A pronounced decrease in compression even in one of the cylinders may well indicate that gas leaks are occurring, as a result of which oil goes through the breather. It should be added that compression can also decrease as a result of valve problems. For a more accurate determination, you should inspect or only one candle on the problem cylinder. The presence of abundant gray-black oily soot is a symptom of malfunctions associated with the cylinder-piston group. If the compression is low, but there is no carbon deposits on the spark plug, then valve problems are likely.

No compression loss will indicate that further checks will be related to the ventilation system. The method of checking this system will be considered on the example of the domestic model VAZ 2110. On other cars, some individual features may be found, but general principle will be similar.

At the very beginning, you need to disconnect the tubes from the valve cover, breather and air duct. Then you should assess the degree of their contamination. If the tubes are clogged or dirty, then they can be cleaned with a carburetor cleaner or gasoline. After you need to blow them compressed air or dry naturally.
Next, you need to get to the oil separator by unscrewing the fixing bolts and removing its cover. After that, the oil separator itself is removed. This device made of special plates. It is required to disassemble the element and rinse. Washing can be done in gasoline and then dried.
In parallel, it is recommended to inspect and flush the valve, as well as check the stroke. This is possible after removing the device. Valve wedging is also eliminated by flushing. The entire list of described actions allows you to keep the crankcase ventilation system clean and maintain its performance.

Let's sum up

In view of the above, it becomes clear that an increase in crankcase gas pressure and oil leakage through the breather indicate a number of problems with the breather or internal combustion engine. Rapid detection and elimination of malfunctions will reduce the cost of repairing the power unit. This is relevant if the problem is eliminated at an early stage, that is, without the consequences that arise after a long period of ignoring the malfunction and further active operation of the engine.

We also add that cleaning the crankcase ventilation system is not a complicated procedure, so in some cases such an operation can be carried out in the garage with your own hands. Moreover, it is recommended to clean the ventilation system regularly during each scheduled maintenance in parallel with the engine oil change.

Finally, we note that quite often abundant oil leaks through the breather do not appear immediately. In other words, the lubricant may drip slightly, which is sometimes subtle. In other cases, about 0.5 or a liter of lubricant can go through the breather from the lubrication system, taking into account the low mileage (on average, 1-3 thousand km). With such a significant leak, the operation of the internal combustion engine is stopped, diagnostics and repairs are carried out.