Complete Petrol System Cleaner For all petrol engines with injectors or carburetor running leaded or unleaded fuel. Suitable for use with vehicles fitted with catalytic converters. Pour entire content of the 250 ml bottle in the tank, preferable before refueling with petrol. Dose for 40 to 60 litres of fuel. The product can be used as a curative treatment or preventative if used on a regular basis.