API Diesel Exhaust Fluid Certification Website

API is the only national trade association
that represents all aspects of America’s oil and natural gas industry. Our 400 corporate members, from the largest major oil company to the smallest of independents, come from all segments of the industry. They are producers, refiners, suppliers, pipeline operators and marine transporters, as well as service and supply companies that support all segments of the industry.

Although our focus is primarily domestic,
in recent years our work has expanded to include a growing international dimension, and today API is recognized around the world for its broad range of programs in areas such as advocacy, research and statistics, standards, certification, and education.

For consumers, API provides the Engine Oil Licensing and Certification System (EOLCS). This voluntary licensing and certification program authorizes engine oil marketers
that meet specified requirements to use the API Engine Oil Quality Marks. The Engine
Oil Quality Marks identify oil marketers that have certified that they meet API engine oil performance requirements.

Consumers also benefit from API’s Diesel Exhaust Fluid Certification Program. Like EOLCS, this voluntary certification program authorizes diesel exhaust fluid marketers that meet specified requirements to use the API Diesel Exhaust Fluid Certification Mark. This Mark identifies diesel exhaust fluid marketers that have certified that they meet ISO performance requirements.