Check the listing for details. Red Line 60103 SI-1 Complete Fuel System Cleaner, 15oz Bottles, 4 Pack. Condition: New. Listed at 49.99 USD. Red Line 60103 SI-1 Complete Fuel System Cleaner, 15oz Bottles, 4 Pack Description SI-1 FUEL SYSTEM CLEANER - 15OZ · Cleans injectors, carburetors, valve and combustion chamber deposits with a concentrated blend of the most powerful high-temp and low-temp detergents available. · Cleans all forms of fuel injectors, including GDI. · Enhances fuel stability; reduces gum and varnish formation. · Use one bottle per tank for most effective treatment, cleans to nearly 100% efficiency in one treatment. · Reduces need for octane by up to two points. · Contains synthetic upper cylinder lubricant. · Cleans pollution control valves. · Suitable for use with oxygenated fuel. · Safe for continual use. · Same chemistry is also available in 4oz dosage as Complete Fuel System Cleaner – Powersports.Red Line 60103 SI-1 Complete Fuel System Cleaner, 15oz Bottles, 4 Pack Description SI-1 FUEL SYSTEM CLEANER - 15OZ · Cleans injectors, carburetors, valve and combustion chamber deposits with a concentrated blend of the most powerful high-temp and low-temp detergents available. · Cleans all forms of fuel injectors, including GDI. · Enhances fuel stability; reduces gum and varnish formation. · Use one bottle per tank for most effective treatment, cleans to nearly 100% efficiency in one treatment. · Reduces need for octane by up to two points. · Contains synthetic upper cylinder lubricant. · Cleans pollution control valves. · Suitable for use with oxygenated fuel. · Safe for continual use. · Same chemistry is also available in 4oz dosage as Complete Fuel System Cleaner – Powersports.