The Customs Service has uncovered an illegal oil laundering plant capable of processing more than 2.5 million litres of fuel per year in Dublin.
It was found on an industrial site in the Ballycoolin area of Blanchardstown last night.
A spokeswoman for the service said the plant used a "relatively unsophisticated method of fuel laundering which involves filtering the fuel through cat litter."
Equipment and a van were seized from the site but no arrests were made.
Customs officials say the plant could have caused a potential loss of £1.75 million to the Exchequer, and warned motorists that laundered fuel can harm vehicles.