A chemical substance called a fuel additive is added to the fuel system of a car in order to change the fuel's characteristics or boost the engine's performance. These additives are made to address a number of problems with engine cleaning, fuel quality, combustion efficiency, and emissions reduction. These additives raise the octane rating of gasoline, which can stop high-compression engines from knocking or pinging. They are frequently found in fast or sports cars. These additives aid in cleaning the fuel system, including the fuel injectors, carburetors, and combustion chambers, of carbon buildup, gum, and varnish. Engine efficiency and performance can both be enhanced by cleaner fuel systems.