Nulon Pro-Strength Diesel Turbo Cleaner is a highly advanced and unique diesel fuel additive. Activated through the combustion process, the additive removes and cleans carbon and soot deposits commonly found on exhaust side components of turbocharged diesel engines. Directions for Use: Simply add a 500ml bottle of Diesel Turbo Cleaner to your fuel tank. One bottle treats from 40 to 100 litres of diesel. Use as required or at each vehicle service interval. Treatment Rate: For optimum cleaning and fastest results, add 500ml to 40 litres of fuel.