Motor oil semisynthetic 5W40: specifications, reviews


Today there are so many motor oils on the market thatto understand them and to distinguish them from each other is not at all easy. In this article, we will discuss one of the oil bases, a semi-synthetic oil. A very important index of lubrication is viscosity. There is a classification that separates the oil according to this indicator. What is semi-synthetic 5W40? And than differs from others? Let's talk about this in more detail.

Oil base

The base for motor oils is:

  • mineral;
  • semisynthetic;
  • synthetic.

Mineral is a natural product,obtained as a result of distillation of fuel oil. The technology of manufacturing such a lubricant is simple. Therefore, their cost is low. They are effective and do not have a strong destructive effect on the elements of the motor. In all oils, including mineral oils, additives with different functions are added. The main thing is to reduce the friction of the parts. However, due to high temperatures, they quickly burn out.

semisynthetic 5w40

The problem was solved in synthetic oils,which are obtained by molecular synthesis. They are characterized by much greater stability of work in comparison with the previous species under any conditions. Such oil is expensive, because the technology of its production is completely artificial.

Semisynthetic grease

5W40, 10W40, 20W40 or any other index of viscosity can be both on a mineral, and on a synthetic and semi-synthetic basis.

Semisynthesis is obtained by mixing twobases: synthetics and mineral water. And the first component is added from thirty to fifty percent, and the second - from fifty to seventy percent. It represents a kind of middle, a compromise between natural mineral water and fully synthetic synthetics.

This base has better stability compared towith mineral, but inferior in quality to synthetic oil. Nevertheless, under different conditions a synthetic variant is preferred to a semi-synthetic species.

Advantages of semisynthetic base

For example, semisynthetic will be better for the enginein the event that the car has a significant mileage. This kind of engine will be more useful, because the synthetics gives a high degree of ignorance. In addition, a semisynthetic basis is chosen for highly-fired desily and gasoline units, as well as for engines with turbo-supercharging. It will effectively show itself and with a cold start.

This lubricant can be easily used at lowtemperatures. The only inconvenience is that semisynthetic (5W40) should change more often. Prices however are much lower than for synthetic oil.

5w40 semisynthetic


This figure means the ability of the lubricating fluid to remain on the surface of engine parts and remain fluid at the same time.

Thus, dry friction of individual elements should not be allowed, and when the cylinders work harder, a minimum frictional force must be ensured.

The oil must be stable for differenttemperatures. Of course, one species simply can not work equally well in extreme heat or fierce cold. But the working temperature of the oil in the engine is very different.

In this regard, a specialclassification of motor fluid by the viscosity parameter, which was called SAE. Thanks to it, it is easy to determine the temperature range, where the work of the motor will be absolutely safe for him. This indicator has both synthetics, and mineral water, and semisynthetic.

oil 5w40 semi-synthetic characteristics


Decipher these numbers as indicated on the labelany motor oil is not difficult. The letter W means that it belongs to winter greases. But if at the same time another number is indicated through the dash, this indicates the all-season character of the lubricant. For example, the semi-synthetic 5W40 considered by us is deciphered as follows.

5W means low-temperature viscosity. Cold start will be possible at a temperature of thirty-five degrees below zero (that is, from five it takes forty to take). This is the minimum temperature at which the engine can operate in a safe mode for itself. But this only concerns start-up, since this characteristic does not apply to the warmed-up motor.

Rosneft 5w40 Semisynthetic

Proceeding from this, it can be concluded that, if inthe region where the vehicle is operated, the temperature does not fall below the twenty-degree mark, the car owner can purchase grease with any number before the letter W.

The number on the other hand meanshigh temperature. It is clear that the higher this index, the higher the temperatures the engine can operate. It is necessary to strictly follow the viscosity index, which is specified by the manufacturer of a particular machine. The recommended brand of oil motorist can ignore, but viscosity must be strictly observed.

shell semisynthetic 5w40

Consider a different oil 5W40 (semisynthetic). The characteristics that manufacturers give are interesting. But also curious are the evaluations of independent experts conducting experiments with different brands.

"Lukoil 5W40" (semisynthetic)

On this basis, excellent performanceare declared by the manufacturer of oil "Lukoil" Lux "5W40". This lubricant can be used for gasoline and diesel units installed on cars, minibuses and light trucks.

The company claims that the brand "Lukoil 5W40"(semisynthetic) provides intellectual protection to the motor, thanks to a new operating formula. Different lubrication components are activated in different operating modes.

For example, at low temperatures "cold" components come into operation, and at the extreme high, on the contrary, "hot", capable of maintaining the optimum viscosity at the same time.

engine oil 5w40 semisynthetic

This brand has the following advantages:

  • provides maximum protection of parts against corrosion and wear;
  • allows safe cold start at low temperatures;
  • reduces engine noise;
  • prevents formation of deposits in the motor.

Evaluation of independent experts

Based on the results of the experiments andreviews of drivers, this oil, along with recognized brands of foreign production, showed quite good results. It is characterized by excellent energy saving, and on other properties it also turned out to be at a high level.

The oil has an average volatility and provides excellent protection under extreme conditions. However, due to the high content of impurities, sulfur does not fully comply with European requirements.

But "Lukoil 5W40" (semisynthetic), reviews from motorists have numerous, most of which - a positive nature.

Semisynthetics "Rosneft"

Among the lubricants on this basis, Rosneft Maximum oil is allocated. This is a semi-synthetic 5W40.

The company positions the product as possessinghigh anti-corrosion properties, and also showing stability when working with the declared temperature, excellent antioxidant and dispersant characteristics.

The oil is designed to work with gasoline units with turbo-supercharging and diesel engines of passenger cars of both domestic and foreign production.

This lubricant of Rosneft 5W40 (semisynthetic) is excellent for operation in Russian climatic conditions, as evidenced by numerous reviews of experienced motorists.

lukoil 5w40 semi-synthetic reviews

The oil will reliably protect the engine at a temperature offrom minus thirty to plus thirty five. It also provides "cold" start-up of the engine, wear resistance to the oxidation process, maintains the necessary pressure at different operating conditions and prevents deposits inside the motor at high and low temperatures.

Evaluation of independent experts

Testing the lubricant also showed good results, and the parameter of cold start-up oil produced impressive results. Reviews of motorists say the same thing.

Semisynthetic Shell

Of the oils of this category of company can be identifiedShell Helix HX7 5W40. This oil is more effective than the mineral base of the same manufacturer. Active additives contained in it, provide protection to the motor and such cleanliness, in which the work of the unit, according to the developers, is equated with the machine that just descended from the conveyor.

You can fill both gasoline and dieselunits with oil "Shell". Semisynthetics 5W40 fulfills its resource almost twice as long as on a mineral basis. And its cost is several times lower than the synthetic lubricant.

In addition, it provides protective anticorrosiveproperties of the engine and a low viscosity at low temperatures is the oil of 5W40. Semisynthetics will prove especially good if it is refueled in a car with mileage that does not work under extreme conditions.

Estimation of car owners

These indicators explain a good demand, whichThis lubricant is consumed by the Russian consumer. In addition to low flow, drivers note the easy start of the engine at low temperature.

Here are some interesting features and estimateshas engine oil 5W40, semi-synthetic. For a certain type of transport, it will be the optimal choice, surpassing even synthetic oil based lubricants.

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