The FuelMAX is a worldwide Patented Fuel Expander For engines up to 4 cylinders. Fuel line up to 16 mm. Works on Gasoline and Diesel Engines Extra performance-premium high octane performance reported on regular gasoline Great results received at Major Diesel testing facility Extends engine life by cleaning existing carbon/varnish deposits from engine cylinders Tested worldwide and at United States Certified EPA Laboratories INSTALLS IN MINUTES! NO TOOLS REQUIRED!