Welcome to the online application system for the API Diesel Exhaust Fluid Certification Program. Please login to manage your license.
If this is the first time you have visited and you would like to learn more about the licensing program, please review the Diesel Exhaust Fluid Certification Program Overview. For assistance with applying for or maintaining a licence, click on the HELP tab above for links to the User Guide. If you have any questions or comments, please contact API through the Helpdesk at firstname.lastname@example.org.