Clear engine deposits with a concentrated cleaner. Take back the power and efficiency lost by carbon and varnish deposits caused by pour fuel quality. You cant always count on getting the best fuel, Ring-Free is the solution. Yamalube Ring-Free is a highly concentrated fuel additive that removes carbon build-up from injectors, carburetors, intake valve, intake ports and combustion chambers. Formulated to combat corrosive element of the added sulfur in Ethanol blended fuels to keep fuel system electronic components and fittings in top shape. Ring-Free is designed to be used continuously and can be used with Yamalube Fuel Stabilizer and Conditioner PLUS without harmful effects. Keep your engine running smoothly even when your fuel source isnt top quality by using Yamalube Ring-Free fuel additive. Key Features Concentrated engine cleaner that clears deposits, prevents varnish and carbon build up Improves power and efficiency in two and four-stroke engines Effectively cleans fuel injectors, carburetors, intake valves, intake ports and combustion chambers Combats corrosive element of added sulfur in Ethanol blended fuels Compatible with use of Yamalube fuel stabilizer and conditioner PLUS Formulated for continuous use. 1 oz. treats 10 gallons of fuel