Where does diesel contamination come from? Understand

As discussed in this post on how to choose the sulfur rate, diesel oil is a very important fuel, used in several engines, such as road, rail or marine vehicles, agricultural, industrial machinery and electricity generators.

In diesel engines and systems, the fuel burns through the heat generated by the high compression of the air. This type of engine is widely used in machinery and heavy vehicles, due to its advantages in terms of performance, durability, safety and maintenance costs. Thinking about the importance of this type of equipment, we will discuss below the reason for the contamination of diesel and its different types.


Where does diesel contamination come from?

Contamination of diesel oil is a major cause of premature wear of injection systems. Therefore, attention and care is needed with the fuel tank, from the refining process to its consumption. According to experts, the three most common sources of diesel contamination are water, suspended microparticles and the inappropriate use of mixed fuel. Find out more about them below:

  • Water contamination

The water in the fuel usually comes from three forms. The first occurs in the condensation inside the tanks due to temperature variation, usually occurring during storage or during use. The second happens when using a fuel of unrecognized quality, potentially contaminated by water.

Finally, the presence of water also occurs with inadequate cleaning of the tanks, leaving water inside. The accumulation of water impairs the combustion of diesel, accelerating the saturation of the filters and can cause damage to the entire fuel system, as well as its deterioration and development of bacterial colonies.

  • Microparticle contamination

Microparticles generally enter the system through poorly sealed lids and open vents, often in storage and during use. Its presence is also verified with the use of inadequate or worn filters, unable to block the entry of abrasive particles. Another common form of this contamination is through the use of corroded, rusted or dust-contaminated tanks.

  • Contamination by inadequate fuel

Another common form of diesel contamination is the inappropriate use of mixed fuels. This is usually noticed with fuels of unrecognized quality, levels of biodiesel mixture that do not meet the compliance of national legislation and when there is a combination of the fuel with non-recommended products, such as kerosene and methanol, for example.

All of these problems can cause damage and damage to the entire engine, such as premature erosion of parts, deregulation, loss of power and higher levels of diesel consumption. To learn more about the main problems and losses that diesel contamination can cause in your equipment, read our post About the subject.

Some basic preventive measures consist of the proper inspection and cleaning of the tanks, of not storing the diesel for prolonged periods of time or leaving it exposed to high temperatures. This accumulation can also be prevented by keeping the transport and storage tanks always full, draining the condensate frequently and using high efficiency separating filters in the supply line.

See in the video a filter that separates contamination from diesel


To combat and avoid contamination of diesel oil, it is necessary to invest in procedures such as oil filtration. It reduces the water content and separates solid particles and other contaminants from the oil, benefiting the engine’s performance, reducing pollutant emissions and the need for interventions, improving the vehicle’s life and economy. Thus, you guarantee greater productivity and the best possible results with your equipment.

In addition to being a simple and efficient process, the results of diesel oil filtration provide benefits to the machinery as a whole. This methodology recovers the lubricating quality of the oil, ensuring the best performance and operation of the diesel engine.

To learn more about the need to filter diesel oil,read our post About the subject. You now have information about the source of the contamination of diesel oil. So, don’t stop there and keep looking for the success of your business: make a quote with our team of experts.

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