Fuel Doctor 1L Fuel Doctor Fuel Conditioner is specifically formulated for Diesel, Petrol and Two-stroke fuel systems to clean gums, varnish and carbon deposits, disburse moisture, kill and disburse microbial material whilst increasing lubricity. The by-products of Fuel Doctor’s formulation are increased thermal efficiency equating to a nominal increase in power, economy plus a decrease in particulate (unburnt fuel). Fuel Doctor breaks fuel contaminants into sub-micron particles allowing them to pass safely and harmlessly through the fuel system to combustion, with no detrimental effects to fuel pumps, injectors catalytic converters or particulate filters. Fuel Doctor will stabilise and extend fuel storage life for up to twenty four months for petrol and five years for diesel.