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Red diesel (gas oil)

Keep your off-road vehicles and equipment moving with assured, competitive red diesel supply from Certas Energy.

About red diesel
(gas oil)

Red diesel is a type of fuel that is used in off-road vehicles and machinery only. The fuel is also known as gas oil or tractor diesel and has traditionally been used in multiple industries, including farming, construction, factories, hospitals and rail. However, due to duty equalisation, red diesel is no longer subsidised for all uses, including commercial.

Red diesel fuel is essentially the same as white diesel fuel, the only difference is that it contains a red dye dye to identify illegal usage in on-road vehicles. Red diesel is cheaper than white diesel due to lower fuel tax duty against the grade, although not entirely exempt, it is heavily rebated. Certas Energy is a reliable supplier of red diesel, with over 900 tankers available to deliver fuel to businesses nationwide.


  • 130 local depots across the UK
  • 900 tankers delivering red diesel nationwide
  • Quality product from reputable refineries
  • Flexible payment options and credit terms
  • Competitive red diesel pricing
  • Excellent customer service


If you have any questions about red diesel or want to get a price based on your requirements, contact our fuel team today.


Where can I find all permitted and non-permitted usages of red diesel after April 2022?

From April 2022 red diesel usage is restricted to the following qualifying purposes:
  • for vehicles and machinery used in agriculture, horticulture, fish farming and forestry
  • to propel passenger, freight or maintenance vehicles designed to run on rail tracks
  • for heating and electricity generation in non-commercial premises, including state schools and hospitals
  • for maintaining community amateur sports clubs as well as golf courses
  • as fuel for all marine craft refuelling and operating in the UK, except for propelling private pleasure craft in Northern Ireland
  • for powering the machinery of travelling fairs and circuses

Those no longer permitted to use rebated fuel will need to use fuels (diesels or biofuels) upon which full excise duty is paid, such as white diesel. For clarification on compliance, contact HMRC’s Red Diesel Entitlement Policy Team at


What is red diesel?

Red diesel is a fuel manufactured for permitted use in off-road vehicles and machinery. The fuel is heavily used in farming industries in tractors, combine harvesters and more. Red diesel is also used in the marine sector and has particularly high usage in fishing boats and fleets. 

Red diesel is the same as regular diesel, but it contains a red dye to prevent it being used illegally on public roads. Red diesel is not designed for use in on-road vehicles, so the red dye helps police officers and authorities easily identify if it is being illegally used.


Where can I buy red diesel from?

Red diesel is not designed for general sale and can only be purchased from specialist fuel suppliers. Red diesel fuel is heavily regulated and misuse of the fuel can lead to legal repercussions, so it’s important to ensure that your purchase is made with a reliable supplier.

Certas Energy is an industry-leader of red diesel fuel supply. As the UK’s largest fuel distributor with 900 tankers delivering nationwide every day, our infrastructure allows us to provide quality red diesel, at competitive prices, with reliable service all year round. We can deliver red diesel in tankers to suit your needs, from 500 litres to 36,000 litres. Call 0345 600 4040 to speak to your local team or request a quote online.


How much is red diesel?

The price of red diesel changes daily due to influences from the global oil market. Prices can also depend on quantity and location, so the price of red diesel really depends on the order being placed and what’s currently happening in the market.

Red diesel is cheaper than white diesel because customers are required to pay a lower fuel tax duty on it.

Certas Energy is proud to be a competitive red diesel supplier and strives to offer our customers a great red diesel price. Find out today’s red diesel prices by speaking to a member of our friendly team on 0345 600 4040 or request a quote online and your local team will come back to you.


Remember my name: FAME

Biodiesel, FAME and your fuel supply – everything you need to know about industry-wide changes to FAME content in fuel. Read our guide.

Red Diesel FAQ

Here, we have put together a series of Frequently Asked Questions based on what customers are asking us about red diesel. 
Got another question? Get in touch

Red diesel is also known as:

gas oil
tractor diesel
rebated kerosene
35 seconds
cherry juice
cherry red
agricultural diesel
medium diesel
digger fuel
marine diesel
generator diesel
All of these fuels are the same and so the same red diesel laws apply to their usage. The key way to identify red diesel fuel is by the red colouring of the fuel, which is applied to help identify illegal usage.

You can find out more about gas oil, its uses and current legislation in our guide to gas oil.

Red diesel is designed to help industries that need a cheaper fuel for work-related purposes. So, the purpose of red diesel is to be used in industries that rely heavily on machinery and vehicles to operate.

As a leading UK supplier of red diesel, Certas Energy can cater to your red diesel fuel needs. Orders start from 500 litres and we can deliver as much as 36,000 litres to your site. Call 0345 600 4040 to speak to your local team or request a quote online.

  • With 130 depots and over 900 tankers, Certas Energy provides reliable nationwide deliveries all year round. Our extensive delivery network covers the whole of the UK including all of these locations:
  • Scotland: Whether you’re in the Highlands, the Lowlands, the Islands, Glasgow or Edinburgh city or anywhere in between, our fuel deliveries cover Scotland.
  • Wales : Our network delivers throughout Wales including towns and cities like Cardiff or Swansea, and coastal areas as well as rural villages
  • North East: Certas Energy provides reliable fuel deliveries to the whole of the North East including Newcastle and all towns and counties throughout the region.
  • North West: Whether your business is in a major city like Manchester or Liverpool, or based in any of the rural areas like Derbyshire or Cheshire, Certas Energy can service your fuel needs .
  • Yorkshire: With a rich industrial and agricultural history Certas has been delivering across Yorkshire for many years, with cities like Sheffield, Leeds and Bradford all benefiting from our dependable deliveries.
  • East Midlands: From the banks of the River Derwent in Derby along to the Cathedral City of Lincoln, we deliver a full range of fuel throughout the East Midlands.
  • West Midlands: Certas Energy is proud to serve customers across all of the West Midlands including cities like Coventry and the UK’s second city, Birmingham.
  • South East: The rolling countryside, towns and coastal areas in the South East of England are serviced with Certas Energy fuel deliveries all year round.
  • South West: From major cities like Bristol through coastal areas like Portsmouth and across to Cornwall, we deliver across the whole of the South West of England.
  • Greater London: As England’s capital, London has a high fuel need that Certas Energy services across all sectors.
  • East of England: With many bustling industries located in the East of England, we deliver fuel supplies to cities and towns, including Essex and Norwich to name just two.

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