How to choose engine oil?  

The most important role played by quality lubricant in the successful operation of any vehicle. And her choice should be treated with the utmost seriousness. Each brand has positioned its products as the best on the market. But do not trust the showy slogans. Choosing the engine oil should be based on objective information and clearly know what is:

    viscosity;

    quality class;

    mineral, synthetic and semi-synthetic oil.

Classification

Before you go to the store, you need to decide in which of the three possible options to select oils. Most budget option - mineral oils. Obtained in the process of refining. The main feature - increased viscosity. As a result of this grease has proven itself well in engines with high mileage.

Synthetic lubricant quite expensive. However, this is offset by their qualities. They can work in a wide temperature range and have good flowability. Furthermore, "synthetic" longer retains its original composition, than other types of oil. This means that it needs replacing less often, which is quite compensates for the higher price.

The intermediate niche of semi-synthetic oil. It is made on mineral basis, the performance of which is enhanced by special additives. By the properties of such lubricant outperforms mineral, but at a price - in synthetic.
Criterias of choice

Once the decision about the type of oil, it is necessary to move to the definition of other factors. Standard SAE classification is based on two factors: the viscosity and the application temperature. If, however, between these figures has a letter W, then this oil is classified as off-season.

For convenience, you can navigate to the following classification:

    summer. Specially designed to protect the engine under conditions of high ambient temperature. Therefore, its use at temperatures below 0 degrees is impossible;

    winter. The main feature of these lubricants - high viscosity and excellent fluidity, making it easier to start the engine in the cold season;

    multigrade oils. This lubricant can change the viscosity, adjusting to the ambient temperature.

With regard to the API classification, it contains information about the performance qualities of the lubricant. The first letter in the marking indicated the S (for a gasoline unit) or C (for diesel). The second letter informs about the quality of the product. The closer it is to the end of the alphabet, the better the quality of the lubricant.