How often should I add Ferox to my fuel?
A. Being that Ferox Gas & Diesel Fuel Additive is a Catalyst and not a Detergent it is safe to use with every fill-up. We recommended that you consistently add Ferox Fuel Saver each time that you fill up. Doing this will not only clean out your engine, it will also prevent future carbon build-up. The more consistent you are, the more money you’ll save.