API Diesel Exhaust Fluid Certification Website

When you pay your API DEF Certification Program licensing fee, you're not only helping your business, but you're also helping the environment and your industry as well.

Licensing fees go toward helping API :

Certify DEF against industry-recognized standards
Monitor the quality of API-certified DEF in the marketplace
Maintain a Directory of Licensees online in real-time
Enforce DEF licensing program requirements

Every license issued is testament to your conviction to the environment, your assurance of quality, and your dedication to meeting EPA diesel engine emissions requirements. With an API DEF License, you can show your customers first-hand that you believe in manufacturing DEF that meets rigorous industry requirements for DEF performance.