When the car engine is running, the temperatureThe gases inside its cylinders reach 2000 degrees. Because of this, there is a strong heating of the power unit parts. In order to divert unnecessary heat from the engine, the machine has a cooling system. But how effectively it will work depends on the quality and characteristics of the coolant used in it (OJ). This liquid is called "antifreeze". And just like all other car consumables, it requires a periodic replacement.

Antifreeze, how often to change

How often do I change the antifreeze in the car? The answer to this question can not be unambiguous, since the timing of replacement depends on a number of factors:

  1. Recommendations of antifreeze manufacturers.
  2. Recommendations of car manufacturers.
  3. Intensity of machine use.
  4. Degrees of wear of the cooling system.

Recommendations of the manufacturer of antifreezes

Each country associated with the automotive industry,produces coolant, guided by its accepted standards. Only such antifreeze goes also for export. Therefore, on the shelves of auto shops such a wide range of cooling fluids having different brands, with their characteristics and service life.

To at least somehow order the currentsituation, the manufacturers of antifreezes began to use for their products the classification used by the concern Volkswagen, which divided the fluids into three classes with their recommended replacement dates: G11, G12, G13.

G11 class

G11 (traditional) - this class includesAntifreeze, produced by the so-called silicate technology. That is, in the cooling liquids of this class, a complex of silicate additives is provided, which protects the inner surface of the metallic elements of the cooling system from corrosion.

How often do I change the antifreeze in a car

Indication of how often it is necessary to change the antifreezeclass G11, should be on the packaging. However, when using antifreezes of this class, it should be borne in mind that over time the protective layer formed by them breaks down, turning into abrasive particles that damage the cooling system. Therefore, antifreeze class G11 should be changed at least every two years.

Class G12

What about G12? This antifreeze how often to change? The answer to this question depends on how the replacement was carried out. If the car cooling system was pre-washed and dried, the life of the new antifreeze will be 5 years. If the system was not washed, during the operation the liquid was refilled, then the working life is reduced to 3 years.

How often do I need to change the antifreeze?

The service life of G12 antifreeze wasincrease due to the fact that they use additives based on carboxylic acids acting directly on the source of corrosion, without forming a protective layer.

In the G12 + antifreeze, inorganic additives have been added to the already existing additives, and in mineral fertilizers G12 + - mineral additives. All these additives improved the protection of the cooling system, but were not affected by the replacement period.

Class G13

The service life of G13 antifreeze is similar to G12 coolant (subject to correct replacement rules), that is from 3 to 5 years.

How often should I change the antifreeze

It should be noted that the antifreeze of this class has a high cost due to the fact that its basis is environmentally friendly polypropylene. There are no other advantages over G12 ++.


Many drivers believe that antifreeze isa separate type of coolant, different from the traditional types of antifreeze, but it is not. Tosol is a liquid developed by the domestic enterprise "Technologies of organic synthesis". Hence the name that the OJ received. TOC is an abbreviation from the developer, and the end of "OL" is an indication of belonging to alcohol liquids. During the Soviet period, there was no need for a patent for the name, so almost all the cooling fluids for cars manufactured in the USSR, and then in Russia, were called the same - "Tosol", which, in fact, is a domestic antifreeze.

How often do I change the antifreeze in the car?

How often to change the antifreeze, is indicated traditionally on the packaging by the manufacturer. Periodicity of replacement of domestic coolant, as a rule, does not exceed 2 years.

Recommendations of car manufacturers for replacement of coolant

General recommendations from car manufacturerson the topic "How often you need to change the antifreeze in the car" is not, each company comes to this issue purely individual, depending on their own developments. So, for example, Volkswagen, General Motors, Mazda, Renault after the machines are released from the assembly line and the factory refueling of the antifreeze cooling system is generally recommended not to change the coolant, setting a lifetime for it. German "Ford" establishes periods of antifreeze replacement in their cars every 10 years or after 240 thousand km of run. "Mercedes" - 5 years. "BMW" and "Mitsubishi" - 4 years. VAZ on its models determines the period of replacement of the antifreeze run in 75 thousand km.

And in the future to change the antifreeze is recommendedon the same one that was primed in the car at the factory. If for some reason it is impossible to determine the original brand of coolant, then it is better to fill the G12 antifreeze, considered to be the most universal, without forgetting to rinse the cooling system.

Dependence of the periodicity of the replacement of antifreeze on the run of the machine

The term of antifreeze replacement also depends on the fact,how intensively the car is used. After all, for the same period of time, different car owners can go through different distances. Therefore, how often to change the antifreeze in the car, directly affects its mileage. On this account, there are general recommendations for replacement. Thus, domestic antifreeze and G11 coolants are recommended to be replaced every 30 thousand km. Antifreezes of a higher class should be changed after 40-50 thousand km of run. It is these thresholds that are considered to be nominally critical, after which the OJ begins to lose its protective properties. But then again, these are only recommendations, since the real terms of the necessary replacement of the antifreeze, primarily depend on the degree of deterioration of the car cooling system.

Antifreeze as often changed on worn out engines

If the car is second-hand, then, respectively,the state of its engine and systems will be far from ideal. Therefore, the timing of replacing the coolant on such machines will also differ from the reference ones. How can I determine if the already filled antifreeze is good for use, how often do I change the coolant on such machines?

To determine the qualitative stateantifreeze in the auto shops are selling special test strips. Their cost is small, but to keep the quality of the coolant cool is very helpful. To do this, the strip is lowered into the antifreeze, after which the indicator colors are compared with the scale included in the test kit.

Antifreeze check

The condition of the antifreeze can also be determined visually. If the coolant becomes cloudy or whitened (lost color), this is the first sign that it loses its properties. If the antifreeze turns brown (dirty), this means that it contains rust particles, you can not pull with replacement. When foam appears in the expansion tank, and its bottom is covered with a layer of solid particles, then it is impossible to pull more with replacement, the coolant must be urgently changed, with mandatory washing.

When to change the antifreeze

In addition, the antifreeze will need to be replaced at the first opportunity, if it has been diluted with another type of coolant or water, since its characteristics are significantly reduced.

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