The Original Liquid Science. Patented & EPA approved Complete Engine, Fuel and Exhaust System Cleaner Reduces Emissions and Improves Overall Engine Performance Cataclean is a patented & EPA-approved complete engine, fuel, and exhaust system cleaner that has been proven to reduce carbon build-up and also clean your vehicle's oxygen sensors, fuel injectors, and cylinder heads. Excess carbon build-up robs your vehicle of horsepower, wastes fuel, and increases emissions output. Cataclean helps to reduce carbon build-up and optimizes your vehicle's complete powertrain. Cataclean eliminates fuel injector build-up cleaning the fuel system for maximum power production Features: EPA Approved Easy to use - simply pop, pour and go 5L Fleet/Industrial package Safe for gasoline, diesel and hybrid vehicles Does not alter fuel composition and is safe for gasoline, diesel & hybrid engines Restores, maintains & helps protect the catalytic converter, oxygen sensors, fuel injectors, cylinder heads and DPF (Diesel Particulate Filter) Lowers total hydrocarbon emissions by up to 50% Reduces harmful carbon build-up on oxygen sensors Improves fuel efficiency Restores engine performance Legal in all 50 states Patented formula