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Gas Oil/Red Diesel

Frequently used in the construction, commercial, industrial, agricultural and rail industries, Gas Oil (also known as Red Diesel) is used to fuel off-road machinery such as agricultural engines and JCBs.

It’s illegal to fill up road vehicles with this fuel, so before even considering placing an order, it’s essential to ensure you understand the law and are qualified to use Gas Oil in a legal manner. Though it has identical functionality to regular diesel, it is marked with a red dye to prevent it from being used in road vehicles, hence the name Red Diesel.

Gas oil accounts for 15% of total diesel used in the UK, and FC Dawes & Son Ltd is regularly making deliveries throughout Bedfordshire, Buckinghamshire and Hertfordshire, whilst we’re equipped to supply bulk quantities at the most competitive prices. Whether you’re based in the heart of Stevenage, a rural location near Milton Keynes or Bedford’s historic town centre, we can supply Gas Oil in minimum deliveries of 500 litres via our tankers or 205 litre barrels.

Call us now on 01462 322180

Rapid Red Diesel deliveries from a reliable team

Having been going strong for more than 70 years, FC Dawes & Son Ltd is dedicated to helping small and large businesses reduce downtime and maximise performance. With our competitively priced Gas Oil you’re not only guaranteed maximum heat output, you’ll also reap the rewards with efficient combustion. We understand the pressure you face in terms of reducing overheads and operating costs, and we’re confident we can help you alleviate pressure on your bottom line, whilst extending the life of your equipment and machinery.

Are you using the correct gas oil for your tractors and off highway machinery?

Engines used within modern off-highway machinery continue to evolve, becoming more sophisticated. It is therefore important that customers use the correct gas oil product for their machinery, as specified by manufacturers.

In 2011, it became a requirement that all fuel used in off-highway mobile machinery must comply with EU Ultra Low Sulphur Diesel (ULSD) regulations, and must therefore contain no more than 10mg of sulphur per kg of fuel. Since white road diesel (DERV) was already ULSD compliant at this time, it is often believed that the specifications for red diesel and white diesel have been identical since the regulation change. This is not the case.

There are two recognized standards of Gas Oil that are currently in use: BS 2869 Class A2 and BS 2689 Class D. Class A2 has a maximum sulphur content of 10ppm and is used for off road vehicles and equipment, while Class D has a maximum sulphur content of 1000 ppm and can only be used for heating or static generators. Class A2 gas oil may be used for either application. Neither of these meet the specification for white road diesel (BS EN590), but one of the key differences in specification between Class A2 Gas Oil and Road Diesel is in the fuels’ cetane values.

Why it’s now vital to follow the advice of manufacturers

BS EN590 has a higher cetane value than does BS 2869, which means it has a shorter ignition delay, and therefore burns more efficiently and cleanly, leaving fewer deposits in the engine’s fuel injection combustion chamber. With manufacturers for the off-highway sector continuously improving the technologies used within agricultural machinery engines, customers are advised to ensure that the most suitable fuel sources are being used. John Deere, in particular, specify that fuel used within their engines must comply with the higher BS EN590 white road diesel fuel specification in order to guarantee performance and avoid invalidating warranties.

Gas Oil 590 meets the same BS EN590 specifications as white road diesel and is therefore suitable for use in farm machinery without the need for fuel treatments or additives.*

*Please note that although Gas Oil 590 meets the specification for white road diesel it must not be used as road fuel.


Following recent changes to the UK’s Renewable Transport Fuel Obligation (RTFO) regulations, F C Dawes & Son Ltd are looking to reiterate advice published by the FPS to business owners and farmers who use mobile machinery in regards to the potential use of FAME in Sulphur-Free Gas Oil (SFGO).

In order to meet new tougher biofuel targets under RTFO some fuel manufacturers may be adding FAME, a biodiesel additive to Gas Oil, which could cause issues for agricultural equipment including Tractors, Forklift Trucks and construction equipment.

Fuel manufacturers must ensure by January 2019, 8.5% of all UK fuels sold by suppliers must be made of biofuel in order to reduce CO2 emissions. FPS Technical Manager Tony Brown explained, “All suppliers are obligated to meet new targets but are free on just how they reach each target. There are different ways to achieve this, including the addition of FAME to SFGO, so we want to warn all users of NRMM (Non-road mobile machinery)”.

FAME is a biodiesel mostly made from recycled cooking oils and plant based material. As a biofuel it is likely to hold a higher water content than petroleum based fuels. Which could lead to fuel contamination and much more serious complications if left untreated. Luckily most modern mobile machinery engines are compatible with fuel containing the levels of FAME set out in the regulations. However it is important that business owners and farmers who use older machinery, are aware of what this could mean for them.

Complications from contaminated Gas Oil include:

  • Many common rubbers, plastics and surface coatings will degrade from contact with fuels containing FAME
  • Clogged filters due to a build-up of larger particles in the contaminated fuel
  • Water contamination due to the higher water content of biofuel. If untreated this could lead to microbial contamination in the form of mould, bacteria and algae growth
  • Fuel may degrade over time causing damage to expensive machinery
  • Higher fuel consumption rate caused by a less powerful fuel

Here are our Top-Tips for preventing contamination of Gas Oil:

  1. Limit storage time of blended fuels to reduce air which can draw moisture from the biofuel
  2. Thoroughly check you tank before or immediately after a delivery. Consider getting a specialist tank clean before your delivery
  3. Regularly check for signs of contamination, including; cracks or erosion to the tank, water droplets, dirt or mould inside the tank, or a change in the distinctive Diesel smell. Remedial action should be taken if any of these signs are found.
  4. Regularly examine filters, pipework and seals. It is recommended that you replace filters every 2-3 deliveries.
  5. Purchase your fuel from a reputable oil supplier, to ensure you receive a high quality fuel and will have someone on hand should you have experience any complications.

Request a FREE quotation from FC Dawes today

If you would like a quotation on our Gas Oil, or require some further information on our fuel services, please don’t hesitate to call us on 01462 322 180 (or your local number). If you don’t have time for a call right now, feel free to send us a quick message and we’ll be back in touch at a time that’s convenient for you.

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