Fuel and Oil Testing Services

Fuel oil testing is a process of analysing and evaluating the quality and performance characteristics of various fuels and oils used in different industries and applications. It involves conducting laboratory tests to assess their composition, properties, and suitability for specific purposes.

The primary objective of fuel and oil testing services is to identify any contaminants or impurities present in the fuel and oil. This way, you can ensure that they meet the required standards, comply with regulations, and perform optimally in their intended applications.

Fuel and Oil Testing Services
Fuel and Oil Testing Services

Expert Oil Testing Services for Reliable Insights

At Network Environmental UK, we specialise in comprehensive fuel analysis services. Our team utilises state-of-the-art fuel testing equipment to ensure accurate and representative fuel sampling.

  • Our chemists are knowledgeable and experienced and specialise in comprehensive oil testing services.
  • We strictly adhere to the ASTM Standard D4057-06 for accurate and representative fuel sampling.
  • Our oil analysis services include both individual fuel sampling and scheduled testing regimes to cater to your needs.
  • Our capabilities extend to analysing various fuels, including stored red diesel, regular diesel, heating oil, and more.


You can trust our oil analysis testing service to provide reliable insights into the health and quality of your fuel to optimise performance and safeguard your operations.

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Fuel and Oil Testing Services

How Does Fuel Oil Get Contaminated?

Fuel oil can be contaminated by a variety of things, including:

Water is the most common contaminant of fuel oil. It can enter the fuel oil through condensation, leaks, or improper loading. Water can cause fuel oil to become unstable and cause corrosion, clogging, and poor combustion.

Bacteria can grow in fuel oil that contains water. It can cause the fuel oil to become acidic, leading to corrosion, clogging, and poor combustion.

Dirt can enter the fuel oil through the tank, the fuel delivery system, or the air. Dirt can cause the fuel oil to become cloudy and lead to clogging and poor combustion.

Other contaminants that can contaminate fuel oil include rust, sediment, and chemicals. These can cause various problems, including clogging, poor combustion, and damage to equipment.

Is My Fuel Contaminated? What Are the Symptoms?

To determine if your fuel is contaminated, you can look out for the following symptoms:

Cloudy Appearance

If your fuel has a cloudy or hazy appearance, it indicates the presence of water in the fuel.

Clogged Filters

If you experience frequent filter clogging or reduced fuel flow, it suggests the presence of sludge build-up in the fuel due to contamination.

Dark Colour

Fuel with a dark colour may indicate the presence of asphaltene particles, accumulating and forming filter blockages.

Varnish Smell

If your fuel emits a varnish-like smell, it is a sign that the fuel is old and has started to degrade.

Rusted Tank

The presence of rust in your fuel tank indicates the presence of water, causing rust and, ultimately, contamination.

Lubricating and Hydraulic Oil We Analyse

Our testing and oil analysis services cover a broad spectrum of oils and lubricants. Our comprehensive analysis includes testing for the following parameters:

Fuel and Oil Testing Services

What We Test When Testing Your Fuels?

We employ cutting-edge fuel analysis technology to thoroughly examine their composition when providing onsite fuel testing. Our comprehensive oil testing and analysis include the following:

Density – We assess the mass per unit volume of your fuel, providing insights into its overall density characteristics.

Viscosity – By measuring the fuel’s resistance to flow, we evaluate its viscosity, which is crucial for proper lubrication and efficient combustion.

ISO Cleanliness – Through particulate examination, we determine the cleanliness level of your fuel, identifying any solid particles or contaminants present.

Microbial Contamination – We analyse your fuel for microbial contamination, including bacteria, fungi, and yeast, which can cause fuel degradation and system issues.

Sulphur Content – Measuring the sulphur content allows us to ensure compliance with regulations and assess potential environmental impact.

FAME Content – We quantify the FAME content for fuels containing biodiesel, which is important for quality control and compatibility assessments.

Water Content – We determine the amount of water in your fuel, as excessive water can lead to corrosion, microbial growth, and reduced fuel quality.

Petrol Contamination – Our testing also detects and quantifies any petrol contamination, ensuring the integrity and suitability of your fuel.

What Will You Get Once the Fuel Is Tested?

Upon bespoke fuel testing, you will receive a comprehensive and detailed report to provide valuable insights into your fuel’s condition.

Our report utilises a user-friendly traffic light system, making it easy to understand and interpret the results. Whether you have extensive knowledge of fuels or not, our report ensures that you are well informed about the condition of your fuel.

In addition to the results, the report includes relevant guidance and recommendations to support you in making informed decisions regarding your fuel management.


Oil analysis/testing is a diagnostic tool used for planned preventative maintenance (PPM) to monitor and evaluate fuel conditions.

Regular fuel testing can help detect contaminants, determine fuel quality, and contribute to providing insights into equipment health, allowing for proactive maintenance and preventing costly equipment failures.

Fuel testing is essential due to the changes in fuel regulations, such as the increased FAME biodiesel content and decreased sulphur content.

These changes expose fuel to a higher risk of quality degradation and increased contaminants. Testing ensures fuel quality compliance and helps detect potential issues that may affect engine performance and longevity.

The turnaround time for fuel test results is typically around 7-10 days. This duration may vary depending on the fuel type being sampled and the severity of contamination.

Our team of experts collects samples onsite, and once the analysis process is complete, you will receive a comprehensive report with the findings and recommendations.

Various factors can cause fuel filter blockages:

  1. Free or dissolved water contamination can lead to filter swelling and reduced fuel flow.
  2. Particles like rust, dirt, and other contaminants can clog filters, hindering fuel transfer and storage.
  3. Bio content, as well as the presence of asphaltenes, can also contribute to filter blockages.
  4. Microorganisms like bacteria, fungi, and mould thrive in water, leading to filter clogging and fuel system issues.
Whatever your situation, we can handle it

Our Services Ensure Regulatory Compliance

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Industry-Recognised Accreditations

We take pride in holding industry-recognised accreditations. These certifications demonstrate our commitment to quality and compliance, and provide our clients with peace of mind knowing that they are working with a reputable and trustworthy partner.