STA-BIL® 'Start Your Engine' Fuel System Revitalizer is designed to ensure easy starting of outdoor power equipment, smooth rough idling and stalling, and helps remove gum and varnish from throttle plate and carburetor. One 4 ounce container will treat up to 1 gallon of fuel and will revitalize old fuel. For all 2 and 4-cycle Small EngineEasy to use, just add to the equipment's fuel tankRevitalizes fuel and the entire fuel system Minimum order quantity for display is 8 bottles.