STP Unleaded Petrol Treatment - 200ml Formulated to maintain engine cleanliness by preventing the rapid build-up of sludge and deposits harmful to the fuel system, especially the intake valves. Technical Features: Keeps the fuel system clean and efficient. Reduces fuel consumption by up to 4%. Reduces emissions. Eliminates knocking and loss of power. Check for corrosion to prevent clogging of filters. Allows the removal of water from the tank and from the supply circuit