Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce Cleans to nearly 100 percent efficiency in one treatment Reduces need for octane by up to two points Contains synthetic upper cylinder lubricant Safe for continual use Use one bottle per tank for most effective treatment of neglected vehicle 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 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