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Since 1924, the American Petroleum Institute has been a cornerstone in establishing and maintaining standards for the worldwide oil and natural gas industry.


API is the premier source for petroleum industry data and information. API's data and statistics are accurate, comprehensive, timely, and quoted widely.


API events are dedicated to standards development, making contacts, and open discussion on areas of interest. These meetings are hosts to some of the most knowledgeable minds in the industry, and they discuss issues that are important to both them and their companies.

Motor Oil Matters (MOM)

Motor Oil Matters has one main goal: to make sure that consumers receive high-quality oil. This happens by maintaining a secure chain of custody for motor oil from oil marketer to distributor to installer to vehicle.


API’s Training Program, API-U, provides comprehensive training on API Standards and Recommended Practices. Through instructor-led and multi-platform eLearning, API-U is reaching industry professionals across the globe.

Certifications Directories

API maintains free directories listing all of the participants in our certification-related programs. These directories are updated in real time for always up-to-date information.

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Worldwide Representatives

For information about API programs and services, we welcome you to contact our local offices or contracted representatives in the countries or regions below. API operates from offices in Washington DC, Houston, Beijing, Singapore, Dubai and Rio de Janeiro. Only API offices in Washington DC and Houston are involved with operational issues (i.e., auditor selection, audit scheduling, client audit reviews). Representatives based in the other locations are information sources. We invite you to contact the closest office to learn more about API programs and services.

API Monogram and APIQR

API is committed to maintaining the highest level of confidence in its certification and/or licensing activities by providing impartial and objective assessments of its client’s management systems. This commitment is supported by processes that manage conflicts of interest, ensure personnel competence, maintain confidentiality of information while promoting openness, and enable communication with all stakeholders.

Individual Certification Programs (ICP)

API’s Individual Certification Programs have been designed to meet the real world challenges faced by the oil and natural gas, petrochemical, and chemical industries with specific certifications for critical roles.

API 510 - Pressure Vessel Inspector
API 570 - Piping Inspector
API 653 - Aboveground Storage Tanks Inspector
API TES - Tank Entry Supervisor
API 1169 - Pipeline Inspector
API 571 - Corrosion and Materials Professional
API 577 - Welding Inspection and Metallurgy Professional
API 580 - Risk Based Inspection Professional
API 936 - Refractory Personnel
API SIFE - Source Inspector Fixed Equipment
API SIRE - Source Inspector Rotating Equipment
API QUTE - Qualification of Ultrasonic Testing Examiners (Detection)
API QUPA - Qualification of Ultrasonic Testing Examiners (Phased Array)
API QUSE - Qualification of Ultrasonic Testing Examiners (Sizing)
API IA-Q1 - Internal Auditor Q1
API IA-Q2 - Internal Auditor Q2
API A-Q1 - Auditor Q1
API A-Q2 - Auditor Q2
API LA-Q1 - Lead Auditor Q1
API LA-Q2 - Lead Auditor Q2

Process Safety Assessments (PSSAP)

A valuable industry benchmarking program to drive process safety performance improvements.

Engine Oil (EOLCS)

API’s Engine Oil Licensing and Certification System (EOLCS) is a voluntary licensing and certification program that authorizes engine oil marketers who meet specified requirements to use the API Engine Oil Quality Marks.

Diesel Exhaust Fluid (DEF)

The API Diesel Exhaust Fluid Certification Program is a voluntary program designed to certify and monitor the quality characteristics of diesel exhaust fluid intended to operate converters with selective catalytic reduction (SCR) in motor vehicles with diesel engines.

Witnessing Programs

Through our one-of-its-kind Witnessing Program, API provides knowledgeable and experienced witnesses to observe critical industry tests and verifications.

Center for Offshore Safety (COS)

The Center for Offshore Safety (COS) is an industry sponsored organization focused exclusively on offshore safety. The Center serves the US offshore oil & gas industry with the purpose of adopting standards of excellence to ensure continuous improvement in safety and offshore operational integrity.