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.
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.
Semisynthetic 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.
Эта основа имеет лучшую стабильность по сравнению with 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.
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 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.
5W40
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.
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.
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.
В компании уверяют, что марка "Лукойл 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.
This brand has the following advantages:
- provides maximum protection of parts against corrosion and wear;
- enables safe cold start at low temperatures;
- reduces engine noise;
- prevents formation of deposits in the motor.
Independent Expert Evaluation
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" (semi-synthetics), reviews from motorists have numerous, most of which are of a positive nature.
Semisynthetics "Rosneft"
Rosneft Maximum oil stands out among the lubricants on this basis. This is a semisynthetic 5W40.
The company is positioning the product as havinghigh properties against corrosion, and also showing stability when working with the declared temperature, excellent antioxidant and dispersing characteristics.
The oil is designed to work with gasoline units with turbocharging and diesel engines of passenger cars, both domestic and foreign.
This lubricant of Rosneft 5W40 (semi-synthetics) is excellent for use in Russian climatic conditions, as evidenced by the numerous reviews of experienced motorists.
Oil will reliably protect the engine at a temperaturefrom minus thirty to plus thirty five. It also provides a “cold” start-up of the engine, wear resistance to the oxidation process, maintains the necessary pressure under different operating conditions and prevents deposits inside the motor at high and low temperatures.
Independent Expert Evaluation
Testing lubricants also showed good results, and the oil on the cold start parameter produced impressive results. Reviews motorists say the same thing.
Shell semi-synthetics
From the oils of this category of the company can be distinguishedShell Helix HX7 5W40. This oil is more effective compared to the mineral base of the same manufacturer. The active additives contained in it provide protection to the motor and such purity, at which the work of the unit, according to the developers, is equated to the car that just left the conveyor.
Можно заправлять как бензиновые, так и дизельные Shell oil. Semi-synthetic 5W40 works its resource almost twice as long as on a mineral basis. And its cost is several times lower than synthetic lubricant.
In addition, provides protective anti-corrosionengine properties and low viscosity at low temperatures is 5W40 oil. Semisynthetics will show itself especially well if it is refueled into a used car that will not work under extreme conditions.
Evaluation of car owners
These figures explain the good demand thatThis lubricant is used by the Russian consumer. In addition to low consumption, drivers say easy to start the engine at low temperatures.
These are interesting features and ratings.has engine oil 5W40, semi-synthetics. For a particular type of transport, it will be the optimal choice, surpassing even synthetic-based lubricating fluids.
