¿Cuál es la composición del aceite de motor?

Motor oil is derived from crude oil. How is it made and what additives are used?

What is the composition of motor oil?

Whether mineral, synthetic or semi-synthetic, motor oil consists of base oil and additives. Let’s take a closer look at what goes into this essential lubricant, and the role of the main additives used.

Composition of mineral, synthetic or semi-synthetic oil

There are three kinds of motor oils:

Mineral oil
Synthetic oil
Semi-synthetic oil.

Each of these motor oils has a different composition: the base is either refined crude petroleum or polymers manufactured in the laboratory.

Mineral oil:

Mineral motor oil is made from crude petroleum. Once extracted and transported to a refinery, the crude petroleum undergoes several refining processes to remove as many impurities as possible. After processing, additives are added to the so-called mineral motor oil to improve its performance.

Synthetic oil:

Synthetic oil can be created chemically in the laboratory, but it can also come from refined petroleum. Refining synthetic oil is a more complex process than for mineral oil: it involves modifying the structure of the hydrocarbon molecules. The processes for obtaining the oil ensure that only the best molecules are retained. Many additives are also added. Given its composition, so-called synthetic motor oil is considered a high-end oil that is purer and delivers higher performance than mineral oil.

Semi-synthetic oil:

Semi-synthetic oil is a blend of synthetic oil and mineral oil.

What is the purpose of the additives used in motor oil?

To ensure the quality, performance, and lifespan of motor oils, additives are added to both mineral oils and synthetic oils.

Type of additive	Role of additive
Oxidation inhibitor additives	Over time, motor oil oxidizes. It lubricates engine parts less effectively. That’s why motor oil must be changed regularly. However, the oxidation inhibitor additive slows this process, improving the motor oil’s lifespan.
Detergent additives	The main property of a detergent additive is to remove the deposits and microparticles that form on surfaces when the vehicle is used.
Dispersant additives	Dispersant additives keep all the deposits and impurities that form when the engine is running in suspension, thus avoiding deposit build-up on engine parts. The deposits are then carried to the oil filter.
Antifoam additives	The use of detergent additives can generate foam on the surface of the oil. This prevents the oil from lubricating engine parts properly. This additive is used to prevent this occurrence.
Anti-wear additives	Also called friction modifier additives, anti-wear additives add a layer of solid oil that lubricates the engine as soon as the vehicle starts up, thus avoiding friction between parts. This additive is mostly used in mineral oils.
Corrosion inhibitor additives	An engine is made of metal parts that are sensitive to rust. Corrosion inhibitor additives protect parts from rust.
Antifreeze additives	These additives help adapt the various motor oils to their environment by modifying the oil’s temperature.

This list contains the main additives but is not exhaustive. There are other types of additives as well, for more information you can contact one of our experts.

Excellium

Discover the power of the premium fuel that makes your engine feel good

LEARN MORE

Engine oil change

Discover our Quartz Auto Services specialized in quick oil changes.

E-Wallet

Did you know that you can pay for your gasoline and diesel purchases from the comfort of your vehicle?

DISCOVER MORE