VP Racing madditive octanium unleaded is a petrol additive designed to increase octane by the maximum amount whilst being safe to use with catalytic converters and 02 sensors.Raises octane by up to 7 numbersSafe to use with catalytic converters and 02 sensorsIncreases throttle response, horsepower and accelerationRemoves gum and varnish from injectors and other fuel system componentsOctanium unleaded can be used in street or race cars and is compatible with unleaded pump fuels. It contains a lead substitute so it can be used to run older cars on unleaded fuel. It raises octane by up to 7 numbers which reduces pre-ignition and allows higher compression and more advanced ignition to be used, or higher boost in turbo charged engines. 0.946 litre (34oz) bottle, treats 38 litres of fuel.