Motor oil semisynthetic 5W40: specifications, reviews

Today there are so many motor oils on the market that it's not easy to understand them and distinguish them from each other. 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 oil by this indicator. What is the semi-synthetic 5W40? And how does it differ from others? Let's talk about this in more detail.

Oil base

The base for motor oils is:

• Mineral;
• Semisynthetic;
• Synthetic.

Mineralka is a natural product obtained as a result of distillation of fuel oil. The technology for 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.

The problem was solved in synthetic oils, which are obtained by molecular synthesis. They are characterized by much greater stability of work than 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 two bases: 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 a better stability than the mineral, but is inferior in quality to synthetic oil. Nevertheless, under different conditions, the synthetic variant is preferred to a semi-synthetic species.

Advantages of semisynthetic base

For example, semisynthetic will be better for the engine in 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 a turbo-supercharging. It will effectively show itself and with a cold start.

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

Viscosity

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 must not be allowed, and with a strengthened operation of the cylinders, a minimum frictional force must be ensured.

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

In this regard, a special classification of motor fluid was developed for 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.

5W40

Decipher these numbers, indicated on the label of any engine oil, is easy. The letter W means that it belongs to winter greases. But if at the same time one more 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 is necessary to take forty). 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.

Based on this, it can be concluded that, if in the region where the vehicle is operating, the temperature does not fall below the twenty-degree mark, the car owner can acquire lubrication with any number facing the letter W.

The number on the other hand means a high temperature indicator. It is clear that, the higher this index, the higher 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.

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 characteristics are claimed by the manufacturer of the oil "Lukoil" Lux "5W40". This lubricant can be used for gasoline and diesel units installed on passenger cars, minibuses and light trucks.

The company assures 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 a low temperature "cold" components come into operation, and at the extreme high, on the contrary, "hot", capable of maintaining the optimum viscosity at the same time.

This brand has the following advantages:

• Provides maximum protection of parts from corrosion and wear;
• Allows safe cold start at low temperatures;
• Reduces engine noise;
• Prevents formation of deposits in the motor.

Evaluation of independent experts

According to the results of the experiments conducted and according to the drivers' comments, this oil, along with the recognized brands of foreign production, showed quite good results. It is characterized by excellent energy saving, and other properties 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 car enthusiasts have numerous, most of which are of a positive nature.

Semisynthetics "Rosneft"

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

The company positions the product as having high properties against corrosion, and also shows 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 cars both domestic and foreign.

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

Oil will reliably protect the engine at a temperature from minus thirty to plus thirty five. It also provides a "cold" start 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 in this category of company can be identified Shell 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 refuel both gasoline and diesel units with Shell oil. Semi-synthetic 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 a protective anti-corrosion properties to the engine and a low viscosity at low temperatures, this oil is 5W40. Semisynthetics will prove especially good if it is refueled in a car with a mileage that does not work under extreme conditions.

Estimation of car owners

These indicators explain the good demand that this lubricant uses for the Russian consumer. In addition to low flow, drivers note an easy engine start at a low temperature.

Here are such interesting characteristics and estimates of engine oil 5W40, semisynthetic. For a certain type of transport, it will be the optimal choice, surpassing even synthetic oil based lubricants.