Diesel additive, designed for large diesel engines (trucks, buses, vans, boats). Restores the spray pattern of injectors. Cleans/lubricates the fuel system (high-pressure pump, fuel lines, and injectors). Upgrades fuel quality (increasing cetane) and improves combustion. Reduces knocking & soot deposits. Protects against oxidation. One bottle (1 liter) is added to a fuel quantity of 75 liters (minimum) to 500 liters (maximum) or add to the diesel filter (at each filter change).