Premier Boat Yard in the Midlands

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Marine Diesel Additives | Diesel Bug Treatment

Diesel Bug Biocide Additive


Suitable for use in all diesel engines, all grades of diesel fuel and all diesel storage tanks.

Approved additive by DAF, MAN, Deutz, NATO, Shell, The Swiss Army and many more

  • Kills & prevents ‘Diesel Bug’
  • Inhibits sludge and slime build up
  • Prevents plugging of filters, injectors and burners
  • Protects against tank and pipe corrosion

A 1 litre bottle of OneShot Diesel Bug Biocide will kill an infestation in 5,000 litres of diesel. It can also be used as a preventative measure and will treat significant volumes of diesel in this form.   We would recommend using either ECO Plus or Storage Pro as it contains enough biocide to prevent growth in a clean system

OneShot Diesel Bug Biocide should be used either as a:

  • Kill dose  - to eradicate an existing "Diesel Bug" contamination OR
  • Maintenance dose -  at every refuel, for maximum protection

This treatment used as a kill dose will destroy diesel bug colonies with no residue and is extremely fast acting.

What is Diesel Bug?

"Diesel bug" is the collective term for fungi, bacteria and microbes that feed at the water / diesel interface in the tank. Elevated temperatures during summer and autumn provide the ideal conditions for "Diesel Bug" to rapidly grow. i.e in the right conditions, a single bacteria can multiply to billions in a matter of hour.

 Heavy Diesel Bug Contamination & Diesel Bug Sludge

Heavy Bug Contamination


Why Worry about "Diesel Bug"?

All Diesel composition changed in 2011. The reduced sulphur ( a natural biocide) and increased bio-diesel (7%) has led to a series of potential issues for diesel users to occur in standing / stored diesel in the UK.

Boat owners need to be aware as they are regularly cruising during this period and this churns the fuel, dispersing the bug throughout the system, fully contaminating the fuel stock. However, the same applies to any diesel equipment that stands with fuel in for long periods in the right conditions.

"Diesel Bug" removal, once contaminated, can be expensive, requiring the fuel filters to be replaced (possibly more than once), full fuel tank clean and probable fuel polishing too. "Diesel Bug" also produces acid as a waste product and has significant consequences for all internal metal parts including fuel lines, engine components, fuel pumps and fuel tanks as well as rubber seals where used.

Contaminated Diesel

Diesel Bug in FuelDiesel Bug Effects


Acid Corrosion due to Diesel Bug



Suitable for all diesel engines and grades of diesel fuel.


Contact us for further information. Wholesale enquiries welcome.