How to choose diesel engine oil?

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Therefore, the ideal is to follow the truck manufacturer's recommendations in the owner's manual. In this way, there will be no error and its “gross” will have ensured the performance foreseen in the factory project.

We will talk, below, about the main specifications of lubricating oils, showing how to identify them.

Lubricating oil composition

The lubricating oils lubricating oils are classified into three types according to their composition: mineral, synthetic and semisynthetic.


They are the most common and cheapest. Entirely made with petroleum derivatives, they have a lubrication capacity that can be less, since, as it is a natural product, its molecules are not uniform. Manufacturers use additives to make these products more stable, however, their shelf life is shorter, requiring more constant changes.


The synthetics are made in the laboratory, by means of chemical engineering, which provides the highest standard of performance and durability. However, due to all this technology, they are more expensive, but ideal for severe use, especially for trucks that run more in an urban environment.


Semisynthetics are mixtures of mineral and synthetic oils (with a minimum of 10%), produced to balance the benefits and disadvantages of both. Therefore, they have lower prices than synthetics and are able to deliver a better performance than pure minerals.

Regarding composition, minerals are the most traditional. So, being able to choose between them and synthetic or semi-synthetic, it is preferable to spend a little more and rely on the most advanced technologies. Because, as we said, its properties have been scientifically designed to deliver the best performance with maximum durability.

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However, it is necessary to pay attention to the specifications of the oil regarding its viscosity and performance, as changes in these aspects can compromise the operation and safety of the engine.

Oil specifications

Lubricating oils are also classified according to their viscosity and performance characteristics. Each engine model, due to its design and operating needs, requires proper oils for correct lubrication.

The vehicle owner's manual contains the ideal specifications for your engine, represented by acronyms and numbers. See what they mean below. Visit this link to gain more ideas: Automobile Remedy


The viscosity characteristics of the oil are responsible for keeping it fluid enough to reach all parts of the engine at the right time and, at the same time, provide its best performance.

As the ambient and, mainly, engine temperatures change the viscosity of the lubricant, manufacturers have developed so-called multivitamin oils, capable of adapting to larger temperature ranges.

The viscosity of an oil is expressed by the acronym SAE (Society of Automotive Engineers, or Society of Automotive Engineers) and a number. The higher this number, the thicker the fluid. An example of this case would be SAE 40 oil.

Multiviscoos, on the other hand, have two numbers separated by the letter “w”, representing the word “Winter”, as in the example SAE 15w40. Thus, the first number refers to the viscosity in cold temperatures, at startup, and the second, when the engine reaches its ideal operating temperature.


Performance characteristics are informed by the acronyms API (in English, American Petroleum Institute, or American Petroleum Institute) or ACEA (in French, Association des Constructeurs Européens de l´Automobile, or Association of European Automobile Manufacturers).

According to the API classification, oils for diesel engines are indicated by the letter "C" followed by another letter. The more advanced the second letter in the alphabet, the more modern the lubricant.

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