Simply pour the contents of any of the conveniently sized bottles into your tank when filling up, and enjoy the savings that are achieved by improving the combustion of your engine. Add to any diesel tank in a ratio of one part per thousand. That means one litre treats one thousand litres of diesel. It is completely safe when used as intended and is backed by the SABS (South African Bureau of Standards) stamp of approval that warrants that it will not cause any damage to your engine. The product also has an EPA (United States Environmental Protection Agency) registration.