The Red Line SI-1 Fuel System Cleaner is unique in that it applies both a cleansing and prevention of future moisture build-up, carbon deposits and debris. Using a synthetic blend of ingredients means that the possibility of any abrasive harm on your fuel system, pump, carburetors or engine are dramatically reduced. This is why so many people rely on Red Line SI-1 for fuel injector cleaning, as well as follow-up maintenance. The Red Line SI-1 not only uses a unique synthetic upper cylinder lubricant but is also designed to handle both the highest and lowest engine temperatures on the market. As each consumer’s vehicle and condition will vary greatly it is understandable how the Red Line SI-1 is a high-demand product that has great application flexibility and positive performance results.