The car is a complex mechanism consisting of thousands of parts, and for its smooth operation, solid elements alone are not enough. Many owners forget that the car literally lives on thanks to the fluids that circulate in its systems, providing lubrication, cooling and force transfer. Ignoring the level or quality of these compounds can lead to costly repairs and even complete replacement of the units.
In this article, we will discuss in detail what liquids are necessary for the functioning of a modern vehicle. You will learn about their appointment, the frequency of replacement and critical errors that beginners often make when self-serving. Technical fluids It is the blood of your car and you should treat it with the utmost care.
Motor oil: the basis of the life of the engine
The most famous and important fluid in a car is motor oil. It performs several functions at once: lubricates rubbing parts, removes heat, removes stain and protects the metal from corrosion. The choice of product depends on the type of engine, its age and operating conditions, so there is no universal solution.
Modern engines require the use of synthetic oils with certain tolerances specified by the manufacturer. SAE viscosity (e.g., 5W-30 or 0W-20) is selected depending on climatic conditions and engine mileage. Using an inappropriate product can cause oil starvation or, conversely, excessive pressure in the system.
⚠️ Attention: Never mix oils of different types (mineral with synthetics) or different brands without an urgent need, as this can lead to a chemical reaction and precipitation.
Oil levels should be monitored regularly, especially on vehicles with high mileage. To check, use a probe located in the underhood space, and add liquid only through the filler neck. Oil filter It is also required to be replaced with each oil change procedure.
Cooling liquid and combating overheating
The engine cooling system cannot function without a special liquid, which is often called antifreeze or tosol. Its main task is to remove excess heat from the cylinder block and prevent the system from freezing in winter. Unlike water, coolant contains a package of additives that protect the radiator and pipes from corrosion.
There are different classes of antifreeze (G11, G12, G13 and others), which differ in chemical composition and service life. Mixing different classes can lead to the formation of a gel-like mass that will clog the thin channels of the radiator. Before adding, always specify what type is poured into your car’s system.
Replacement of liquid is usually made every 2-5 years, depending on its type. It is important to carry out this procedure on a cold engine to avoid burns and damage to the system due to excessive pressure.
Particular attention should be paid to the expansion tank. The level of liquid in it should be between the marks MIN and MAX. If the level is constantly falling, this is a signal of malfunction: perhaps a gasket of the HBC is pierced or there is a leak in the pipes.
Brake fluid: Your safety
The braking system of the car operates under high pressure, and a special hydraulic fluid is used to transfer the force from the pedal to the calipers. Most often used formulations on a glycolic basis with the marking DOT-3, DOT-4 or DOT-5.1. The main characteristic of such a liquid is the boiling point, which should not decrease with time.
The problem is that the brake fluid is hygroscopic, that is, actively absorbs moisture from the air. Over time, the water content in it increases, which leads to boiling during intense braking and the formation of steam stoppers. As a result, the brake pedal can "fail", and the car will lose the effectiveness of braking.
- 🔴 Change the brake fluid every 2 years or 40-60 thousand km of mileage.
- 🔴 Use only the liquid specified in the instructions for your vehicle (usually DOT-4).
- 🔴 Keep the liquid from getting on the paint coating - it dissolves the paint.
Checking the condition of the liquid is possible with the help of a special tester that measures the percentage of water content. If the device shows more than 3% moisture, the system must be pumped and replaced immediately.
Fluid for power steering (GUR)
In cars equipped with hydraulic power steering, a special oil ATF (Automatic Transmission Fluid) or liquid for GUR is used. It provides ease of rotation of the steering wheel and transfers pressure from the pump to the rack. In modern electric boosters (ERM), this liquid is not used, since there is an electric motor.
Signs of problems with the GUR system are the hum of the steering wheel, especially at low revs, and tight rotation. Often the cause is low fluid levels or aging. Check the level through the probe on the tank or through the viewing window, if it is provided by the design.
What happens if you drive without liquid in the GUR?
Operation of the car with an empty tank of GUR will lead to a rapid failure of the high pressure pump. Metal shavings from dry friction will tear apart the entire system, including the rack, which will require expensive repairs or replacement of units.
Some car manufacturers use the same oils in GURs as in automatic transmissions, but this is not a universal rule. Always check the label on the tank cover or the operating manual.
Transmission oils: manual transmission, automatic transmission and gearboxes
The transmission of the car requires special attention. In manual transmissions (MKPs), transfer boxes and differentials, viscous transmission oils are used. They create a strong film on the teeth of gears, preventing them from breaking under huge loads.
Automatic transmissions (AGB) and CVTs work on a different principle. In them, the oil performs the function of not only lubrication, but also the working body for the transmission of torque. Therefore, the requirements transmission oils The machines are extremely high and their replacement often requires special equipment.
| Type of node | Type of liquid | Replacement interval (example) |
|---|---|---|
| Mechanical transmission | Transmission oil (75W-90) | 60,000-90,000. km |
| Automatic transmission | ATF (VIN specification) | 40,000-60,000. km |
| Main gear (reducer) | Hypoid gear oil | 60,000. km |
| The transfer box | Specialized oil | 40,000-500,000. km |
It is important to understand that many modern automatic transmissions oil is poured "for the entire life", but this often means a warranty period or 150 thousand km. To extend the life of the box, experienced masters recommend changing the liquid more often.
Glass-washed liquid and other formulations
Completes the list liquid for washing glasses, or simply "freezing". Despite its apparent simplicity, the choice of this product is critical for safety. In summer, you can use ordinary water with shampoo, but in winter you need an alcohol-containing composition that will not turn into ice at negative temperatures.
Quality liquid should effectively remove contaminants, not leave divorces and not have a sharp unpleasant smell that causes a headache in the driver. Cheap methanol-based analogues are dangerous to health and can damage rubber seals and paint coatings.
☑️ Checking fluids before winter
Also in the car can be used special lubricants for bearings, lithium lubricants for hinges and graphite formulations for springs. Although they do not “pour” into the system in large volumes, their presence and condition directly affect comfort and handling.
Frequent errors in fluid maintenance
Even experienced drivers sometimes make mistakes that can be costly. One of the most common is to add different types of liquids without understanding their compatibility. For example, adding water to antifreeze in summer can reduce its freezing point in winter to critical values.
Another mistake is ignoring the color and transparency of liquids. If the oil turned black ahead of time, and the antifreeze became rusty, this indicates problems inside the aggregates. Diagnostics by fluid It allows you to identify hidden defects at an early stage.
⚠️ Attention: Waste technical fluids (oil, antifreeze, brake fluid) are hazardous waste and are prohibited from draining into the ground or sewerage. Take them to special reception points.
Always keep in the trunk small supplies of basic liquids: a liter of motor oil, a bottle of antifreeze and a wash. This will help you get out of a difficult situation away from home and service.
Keep the liquid canisters in the trunk tightly closed and upright to avoid spilling and the appearance of a persistent smell in the cabin.
Questions and Answers (FAQ)
Can antifreeze be mixed in different colors?
Color is not a guarantee of compatibility. Only liquids of the same class (e.g. G12 vs G12+) can be mixed, even if their colors are different. Mixing different chemical bases (silicate and carboxylate) will lead to precipitation.
How often should I change the engine oil?
The standard interval is 10-15 thousand km, but in urban conditions (congestion, short trips) oil ages faster. Motor watches are a more accurate parameter: it costs every 250-300 hours to change oil.
Why does it smell like gasoline from oil?
The smell of gasoline in the oil indicates the fuel entering the crankcase of the engine. This can be caused by malfunctioning nozzles, ignition system or rich fuel mixture. Immediate diagnosis is required.
Should I wash the engine when changing oil?
With regular replacement of quality oil, washing is not required. Washing oils only make sense when switching from an unknown product or when there is a large amount of sludge in the engine.
Regular monitoring and timely replacement of all technical fluids is the cheapest way to avoid major car repairs.