Buying a new car is always an exciting moment, marking the beginning of a new era in the life of the owner. However, many forget that immediately after leaving the dealership begins a critical period known as the “Day of the Day”. run-in. This is not just a myth or a relic of the past, but a necessary technological process, on which the durability of the power unit and transmission directly depends.
The question of what it means to run a car is often controversial among motorists. Some argue that modern cars do not require any restrictions, while others refer to the first thousand kilometers of mileage with awe. The truth lies in the physics of friction: even perfectly processed parts in the factory have microscopic irregularities that must be worn away from each other.
Ignoring the rules of the initial stage of operation can lead to increased oil consumption, a decrease in engine power and even premature wear of the piston group. In this article, we will discuss in detail all aspects of the correct commissioning of the machine to your motor-car He has served faithfully and faithfully for many years.
Physical processes of grinding engine parts
To understand the essence of the process, you need to look inside the internal combustion engine. The surfaces of cylinders, pistons, crankshaft and other moving elements, despite the high accuracy of processing, have a microrelief. In the process of working under load occurs working-outDuring which the projections are smoothed, and the gaps come to optimal values.
It is during this period that a stable oil film is formed. If extreme loads are applied to the engine in the first thousand kilometers, micronervousnesses can be cut too aggressively, forming metal shavings. This shaving gets into the oil and starts to work as an abrasive, damaging other nodes. Therefore The most intense wear occurs in the first 1000-3000 km of run.
Modern factory oils contain special additives that facilitate this process, but they are not all-powerful. Temperature conditions They also play a key role: parts must warm up evenly and expand to working sizes for the pairing to be perfect. The sudden temperature surges that occur when driving aggressively can upset this balance.
What happens to the metal when it is rolled?
At the microscopic level, plastic deformation of the peaks of roughness occurs. Metal "flows" filling the troughs, which creates a perfectly smooth surface necessary for tightness of the cylinders and minimal friction.
Do you need to run down modern cars?
With the development of production technologies and the advent of new alloys, the requirements for running have changed, but have not completely disappeared. Many manufacturers in operating manuals Toyota, Volkswagen or Hyundai They provide recommendations for the first 1,500–2,000 km. This is because even robotic machines cannot create a perfectly smooth surface without laundry.
However, it is worth distinguishing between factory run-in, which is often carried out on the stands, and real operation in a variety of road conditions. In reality, the load on the engine, gearbox and braking system vary much more. Therefore, the answer to the question of whether a modern car is needed is unambiguous: yes, but its character has become more gentle.
Particular attention should be paid to the transmission. In automatic and robotic transmissions, the grinding processes of friction discs and gears also take time. Sharp starts and slips during this period can lead to uneven wear of friction packets, which in the future will manifest itself in the form of jerks during switching.
Recommendations on driving modes in the first 2000 km
The main rule of running is a variety of loads and the lack of constancy. You can’t always drive at the same speed, for example, 90 km / h on the highway. It is useful for the engine and transmission to work in different speed ranges so that laundry occurs evenly over the entire surface of the parts.
It is not recommended to use the regimen kickdown (Sharp pressing of the gas pedal to the end) for overtaking. Also, long-term operation of the engine at idle speeds and movement in the "traction" mode in high gear at low speed should be avoided. The optimal range of revolutions for gasoline engines in this period is from 2000 to 3500 rpm.
☑️ Rules for engine run-in
In urban conditions, try to predict the traffic situation, so that you use brakes less often and do not accelerate again. Smoothness is the key word of this period. If you feel that the car lacks traction in the current gear, it is better to switch to a reduced, but do not "twist" the engine to cut off.
Features of running-in diesel and turbocharged engines
Diesel engines, especially those equipped with turbocharging, have their own characteristics. The turbocharger rotates at a tremendous speed, and its bearings also require careful laundry. The owners of these cars, whether BMW, Audi or KiaYou should be especially careful about the quality of fuel and oil.
For turbocharged engines, it is critical to let the engine run at idle speeds before jamming after an active ride. This allows the oil to continue to circulate through the turbine bearings, diverting heat. During the run-in period, this rule must be strictly observed to avoid coking oil in bearings.
⚠️ Note: When operating a diesel with a particulate filter (DPF) during the run-in period, try to go to the track more often. Urban driving may prevent the system from regenerating the filter, which will cause it to become contaminated quickly before the laundry is finished.
Diesels often have higher torque at low revs, which provokes drivers to switch to higher gears earlier. During the run-in period, this should not be done. Let the engine go to working turns so that the pistons rings fit correctly to the walls of the cylinders under sufficient gas pressure.
Brake system and transmission run-in
It's not just the engine that needs attention. Brake pads and discs also have their own laundry period, which is usually between 300 and 500 km. At this time, the effectiveness of braking can be reduced, and the smell of burning from heating parts is normal.
The table below shows the approximate parameters of restrictions for various components of the car during the run-in period:
| Car assembly | Recommended mileage | Limitation | Purpose |
|---|---|---|---|
| Engine. | 0 - 2000 km | Up to 75% of max. capacity | Laundry of piston rings |
| Transmission (ACT/LAN) | 0 - 3000 km | Smooth switching | Friction adaptation |
| Brake system | 0-500 km | Avoiding heavy braking | Formation of the friction layer |
| Suspension | 0 - 1000 km | Avoid pits and fords | Shrinkage of springs and Silentblocks |
The transmission, whether it is a mechanic, automatic or a variator, also goes through the adaptation stage. In automatic boxes, electronics are trained in driving style and grinding friction discs. Sharp selector jerks or slip-up starts can disrupt this process, leading to kicks and delays in the future.
Check the tension of the belts and the condition of the technical fluids after the first 1000 km. During the run-in period, micro-leaks of seals are possible, which are eliminated after lifting or simply adding fluid.
Checkpoints and post-run-in maintenance
The completion of the run-in period is marked by the first scheduled maintenance, often referred to as "zero maintenance". At this point, the engine oil and oil filter must be replaced, even if the manufacturer claims that the oil is filled for the entire life of the oil. In the oil at this point accumulates the maximum amount of wear products.
The wizards on the service should also check the tightening of threaded joints, the condition of the brake pads, the level of fluids in the transmission and the cooling system. Sometimes adjustment of valves is required if the engine design suggests this, although modern motors are more commonly used hydraulic compensators.
⚠️ Warning: Do not ignore the appearance of extraneous noises or vibrations during the run-in period. If you hear a knock, creak or smell a burn, contact the service immediately. It is better to be safe than to be denied a guarantee due to a defect.
After walking 2-3 thousand kilometers, you can gradually increase the load. However, a sharp shift to an aggressive driving style is still not recommended. Let the car finally "get used to" on the road, and it will thank you with reliable service.
The first maintenance after running is a critical procedure, since it removes all the metal shavings from the engine, formed as a result of grinding parts.
Can I drive a new car on a long trip immediately after buying?
Technically possible, if you observe the speed limit and do not overload the car. However, long-distance travel often involves monotonous driving at a constant speed, which is not very useful for the engine during the run-in period. Try to vary the speed and give the car rest.
Does the type of fuel affect the quality of the run-in?
Yeah, absolutely. Using fuels with an octane number below the recommended can cause detonation, which is devastating for the piston group, especially during the period when parts have not yet been worn. Pour only quality fuel of proven brands.
Do I need to change the oil in the gearbox after running?
In most modern cars, the replacement of oil in the automatic transmission or manual transmission after running is not provided by the manufacturer. However, if you plan to operate the car in difficult conditions, early change of oil in the transmission (by 5-10 thousand). km) will significantly extend its life by removing the wear products of the gears.
How do you know if the test was successful?
Successful run-in is characterized by stable fuel consumption (it can be higher at first, and then decrease), the absence of extraneous noise, smooth engine operation at idle speeds and predictable transmission behavior. The pace of the process should also improve compared to the first few days.