The #1 selling brand for over 50 years in helping prevent gas-line freeze up by removing water from fuel systems. HEET also aids in quick cold weather starts by preventing frozen fuel lines. With its rust and corrosion inhibitors HEET helps keep your fuel system clear of power-robbing gum condensation and corrosion. HEET can be used in fuel injected and carbureted engines with unleaded and leaded fuels and is safe for catalytic convertors oxygen sensors and fuel injectors.