Choosing the right lubricant for the engine is not just a formality, but a critical maintenance stage, on which the power unit life depends. Owners often face a dilemma: rely on the advice of friends or use specialized services. VMPA selection of oil by car This is one of the most thought-out tools for solving this problem, especially for those who operate equipment in difficult climatic conditions.
Modern internal combustion engine requires strict compliance tolerances and specifications. An error in the choice of product can lead to accelerated wear of friction pairs, the formation of soak or even failure of the catalyst. That is why the use of proven selection algorithms becomes a standard of competent operation.
In this article, we will discuss in detail how the selection system works, what parameters to pay attention to and why. viscosity It is a key indicator for modern motors with systems of change of phases of gas distribution. You will learn to independently determine the necessary characteristics, based on the technical data of the manufacturer.
Principles of operation of the lubricant selection system
The selection algorithm is based on the analysis of a set of parameters entered by the user. The system not only gives out a list of available canisters, but conducts deep filtering according to the technical requirements of your engine. It is based on a database of specifications of automakers, such as BMW Longlife, MB-Approval or VW 504/507.
The first step is always to identify the vehicle. The system asks for make, model and most importantly, engine type. This is necessary, since fundamentally different additive packages may be required for gasoline and diesel units. For example, diesel engines with particulate filters (DPF) require oil with low sulfate ash content (Low SAPS).
Then there is an analysis of the climatic zone of operation. VMPAV. It takes into account the temperature ranges characteristic of different regions of Russia. This allows you to recommend products with optimal low-temperature fluidity, which is critical for cold start-up. Incorrect choice on this parameter can lead to oil starvation in the first seconds of work.
⚠️ Please note: Don’t ignore the season recommendations. Using summer oil in winter can cause it to turn into a gel at negative temperatures, which will instantly disable the oil pump.
The final result is a list of products that fully meet or exceed the manufacturer’s requirements. It is important to understand that the system offers options that guarantee protection, but not always the only possible. However, to depart from the recommended specifications without a strong engineering justification is not worth it.
Key parameters: viscosity and tolerances
When analyzing the proposals yourself, it is necessary to clearly understand the difference between viscosity and tolerances. The SAE viscosity (e.g., 5W-40) indicates the temperature range of performance, but does not indicate the chemical composition. The admissions also confirm that the oil passed the tests of a particular automaker.
Let's look at the marking. 5W-40. Number 5 indicates low temperature viscosity, and 40 - high-temperature. Modern turbocharged engines often require more liquid oils, such as: 0W-20 or 0W-30. This is due to the need for rapid supply of lubricant to remote nodes and reducing the load on the oil pump.
Particular attention should be paid to the parameter. HTHS (High Temperature High Shear). It characterizes the viscosity of the oil at high temperature and high shear speed. For engines with a system Vanos or VTEC This setting must be strictly within the limits specified by the manufacturer. Too low HTHS will lead to the destruction of the oil film, and too high - to overheating and increased fuel consumption.
Below is a table of viscosity and temperature regimes, which will help to orient in the numbers:
| SAE viscosity class | Lower limit (°C) | Upper limit (°C) | Typical application |
|---|---|---|---|
| 0W-30 | -35 | +30 | Northern regions, new engines |
| 5W-40 | -30 | +35 | Universal, all-season |
| 10W-40 | -25 | +35 | mileage engines, temperate climate |
| 15W-40 | -20 | +40 | Old diesel engines, harsh conditions |
Algorithm of actions: step-by-step instructions
Recruitment through specialized services, including solutions from VMPAV.It requires a consistent approach. Errors in the data entry phase can lead to incorrect results. Therefore, it is important to act methodically, checking with the technical documentation of the car.
Start by searching for the VIN code of the car. This is a 17-digit identifier that contains complete complete configuration information. In some systems, entering a VIN code allows you to automatically determine the engine type and environmental class, which eliminates the human factor in the selection.
If automatic VIN search is not available, go to manual selection. You will need to know the engine size, fuel type and year of production. This information is provided in the vehicle registration certificate (VAT). Beware: Restyled models may have changed lubricants requirements.
☑️ Checklist before buying oil
After receiving a list of suitable products, compare their prices and container volumes. It is often more profitable to buy a 4 + 1 liter canister than two separate containers. Also check the production date indicated on the label, as the oil has a shelf life.
Specifics of selection for cars with mileage
Operation of a car with a large mileage makes its own adjustments to the selection procedure. The gaps in the friction pairs increase, the oals can sulphur, and wear products appear in the system. The manufacturer’s standard recommendations may be ineffective.
For such engines, it is often recommended to switch to oils with slightly increased viscosity. For example, if the company recommends 5W-30For a motor with a mileage of more than 200,000 km, it may be relevant 5W-40. This will help to compensate for wear and reduce the stress. However, this should be done carefully so as not to disrupt the work of hydrocompensators.
Special attention is required for cars that previously filled with low-quality lubricants. In such cases, before switching to a high-quality synthetic product, engine washing may be required. VMPAV. offers special washing compositions that gently remove deposits without damaging rubber seals.
⚠️ Warning: A sharp switch to high-cleaning-power synthetics in a dirty engine can lead to the separation of large pieces of sodium and clogged oil channels. Use the washing oils gradually.
Also for old engines, oils with a high content of anti-wear additives are relevant. They create a stronger film on surfaces, protecting the metal even when the pressure in the lubrication system decreases.
Common Mistakes When Choosing Oil
One of the most common mistakes is to focus only on the brand, not the specification. The buyer sees a known name on the label and ignores the tolerances. As a result, oil enters the engine, which physically cannot provide the necessary protection for this design.
The second mistake is mixing oils from different manufacturers. Although modern standards API and ACEA They are compatible, chemical additive packets can react. This leads to precipitation or foaming. If you urgently need to add oil, and there is no one on hand that was poured, it is better to add any quality product to the nearest service, but then completely replace the liquid.
The third mistake is to ignore the intervals of replacement. Even the most expensive oil loses its properties. In conditions of traffic jams and short trips, the oil resource is reduced by half compared to the declared plant. Motor watches are a more accurate criterion for determining the replacement time than mileage.
What happens if you pour oil above the maximum?
Excess oil leads to foaming, as the counterbalances of the crankshaft begin to intensively whip the liquid. The pressure in the system drops, the lubricant ceases to flow to the nodes, it is possible to squeeze out the osteoils and fail the catalyst due to oil entering the exhaust tract.
Effect of operating conditions on product selection
Operating conditions play a crucial role. The city start-stop cycle is the hardest for the engine. Frequent warming up, idling and low speeds lead to the accumulation of moisture and acids in the oil. Such conditions require products with enhanced detergent and dispersant properties.
Road maintenance, on the other hand, is more gentle. The engine operates in the optimal temperature mode, the oil is less oxidized. However, stability of viscosity at high speeds and temperatures is important here. Oils with a high viscosity index are better suited for long speed regimes.
For regions with extremely low temperatures, such as Siberia or the Urals, pumping capacity is critical. In this case, VMPA selection of oil by car Priority will be given to products on a synthetic basis with a class 0W. Mineral and semi-synthetic oils in such conditions may become unsuitable already at -25°C.
Keep checks and certificates for purchased oil. In case of a dispute with the engine, this will help prove that quality materials that meet the requirements were used.
Frequently Asked Questions (FAQ)
Can synthetic and semi-synthetic oil be mixed?
Technically, modern oils are compatible, but the mixture will have averaged characteristics. It is best to avoid mixing different types of bases, as this can reduce the effectiveness of the additive package. In an emergency, you can add, but then you should make a full replacement.
How often should the oil filter be changed?
The oil filter changes with each oil change. Using an old filter with a new oil will negate all the benefits of fresh lubrication, as a contaminated filter element can open the bypass valve, letting dirt into the engine.
Does the octane number of gasoline affect the choice of oil?
There is no direct effect, but high-powered engines that require high-octane fuel often have more stringent requirements for thermal stability of the oil. Therefore, for such engines, higher-grade oils are usually recommended.
Is it true that the oil gets darker due to poor quality?
On the contrary, if the oil after replacement remained light after 2-3 thousand km of run, this is a bad sign. This means that the detergents do not work and do not remove the stain. Good oil should darken, keeping the contaminants suspended until the next replacement.
Competent selection of oil, taking into account real operating conditions and the technical condition of the engine, is the easiest way to prolong the life of the car and avoid expensive repairs.