Ford Fuels Commercial

Diesel Defender

Diesel Defender is a liquid anti-theft marker dye for UK non-rebated fuel, typically known as white diesel, road diesel or DERV.

Billions of litres of fuel are stored all over the UK at numerous commercial sites. This fuel has a value of millions of pounds and is therefore extremely vulnerable to theft. It can be stolen from outside the organisation or more shockingly and more commonly, from within the organisation.

Since 1st April 2022 many businesses are no longer able to use rebated fuel, known as red diesel or marked gas oil, for their operations and so the stored fuel now appears identical to that bought for personal use and puts stocks of white diesel at a higher risk of theft.
Diesel Defender is a liquid blue dye that will colour white diesel to produce a green fuel and act as a deterrent to thieves.
Tank stickers can be supplied on request to advertise that the fuel has been dyed to prevent theft.


• To demonstrate importance of operational investment on site.
• To demonstrate that fuel use is being closely monitored and can be traced.
• If there is a fear or suspicion of theft by external persons or internal staff.
• With each fuel delivery.


Typical applications are white diesel for use in construction equipment, cooling or heating units in road and rail transport, airport vehicles, forklift trucks, electricity generation and heating for commercial premises to deter theft of fuel and prevent significant financial loss of operational investment.


Diesel Defender contains Dyeguard® 673KNF technology which has been notified to HMRC with a technical report of compliance to satisfy Regulation 14(3) of the Hydrocarbon Oil (marking) Regulations 2002 which states: “No substance calculated to impede the identification of any marker may be added to oil”.

Therefore Diesel Defender;

  • Causes no issues with identification, quantification, and classification of marked rebated fuels within mainland UK.
  • Is notified with HMRC.
  • Does not cause interference with statutory markers.
  • Has a unique chromatic profile which is distinct from statutory markers and does not impede their measurement.

Fuel containing Diesel Defender;

• Although visually similar to the Republic of Ireland tax rebated fuel, the roadside (Euromarker) test can be used readily to confirm that it is not ROI tax rebated fuel.
• Will not give false positive results on any roadside tests used in the determination of statutory markers applied to tax rebated fuels in the UK.
• Any statutory markers applied to tax rebated fuels in the UK will provide correct results when tested by law enforcement agencies.

Diesel Defender has been demonstrated to comply with Regulation 14(3) of the Hydrocarbon Oil
(marking) Regulations 2002 and is permitted for use in non-rebated UK DERV.


For more information and to place an order, please do not hesitate to contact us.