Skip to main content

Engine Oil Licensing & Certification System (EOLCS)


API is mindful of the recent winter storm which tragically struck Texas, parts of the Gulf Coast, and the Midwest. The storm’s aftermath is likely to impact refinery and petrochemical plant operations necessary to the supply of components used to formulate API-licensed engine oil products. We wish to remind licensees that EOLCS has an Emergency Provisional Licensing procedure in place in case of such a disruption. If a supply of base oil or additives utilized by a licensee is disrupted, the licensee may apply for short-term Emergency Provisional Licenses. For more information, please refer to Section 6.9 of API 1509, foundhere。任何问题都可能被引导到

API’s Engine Oil Licensing and Certification System (EOLCS) is a voluntary licensing and certification program that authorizes engine oil marketers that meet specified requirements to use the API Engine Oil Quality Marks. Launched in 1993, API’s Engine Oil Program is a cooperative effort between the oil and additive industries and vehicle and engine manufacturers Ford, General Motors, and Fiat Chrysler and those represented by the Japan Automobile Manufacturers Association and the Truck and Engine Manufacturers Association. The performance requirements and test methods are established by vehicle and engine manufacturers and technical societies and trade associations such as (ASTM), (SAE), and the American Chemistry Council (ACC).

The Engine Oil Program is backed by monitoring and enforcement program that ensures licensees adhere to program requirements. This includes running physical, chemical, and performance tests on licensed engine oils and verifying that the API-registered Marks are properly displayed on containers and convey accurate information to consumers.

About half of the program’s licensees are based in the United States, and the other half are spread around the globe. A complete list of licensees is available on ourlicensee directory

API Starburst
API Donut

Motor oil has mattered for 70 years.


Download 70 Years

该程序的要求在API 1509,发动机油许可证和认证系统中描述。本标准描述了该计划的性能要求,解释了当前的发动机石油服务类别,显示了如何使用标记,并解释监测和执法计划。API 1509引用的标准,例如ASTM D 4485,发动机油性能的标准规范,以及SAE J300,发动机油粘度分类,也在定义该计划方面发挥着关键作用。这些可以通过他们的赞助组织来购买。

Monitoring and Enforcement Program

API has been testing packaged and bulk engine oils under its Aftermarket Audit Program (AMAP) since 1994. AMAP replaced the Oil Labeling Assessment Program (OLAP), a testing program jointly funded by the U.S. Army, the Independent Lubricant Manufacturers Association (ILMA), the former American Automobile Manufacturers Association (AAMA), and API.

同理,API-licensed引擎油购买in the marketplace and tested to determine their physical, chemical, and performance properties. The results are compared to licensee formulations on file at API. Conforming oils show test results that are consistent with the formulations on-file and meet program requirements. All samples undergo elemental analysis, viscosity at 100°C, and high-temperature/high-shear testing. They may also be tested for cold cranking, pumpability, volatility, gelation, foaming, filterability, flash point, and shear stability. Product packages are checked to make sure they correctly display the API Marks and carry product trace codes and bulk oil receipts are checked for compliance with NIST Handbook 130 requirements.


如果许可的油与API文件上的物理和化学数据不匹配,API将与被许可人合作,以评估不合格,并采取适当的纠正措施。未解决的不合格问题受到API 1509中拼写的附加执行操作。操作可能包括终止许可证,以显示API标记并从市场中删除非组合产品。如果许可或未许可的石油显示不当标签或未经授权或不准确的标签基础,则API将要求营销人员停止和停止犯下违规行为,并请求违反违规行为的核查。

In addition to sampling licensed oils, API also samples and tests products encountered in the marketplace that are using the API certification marks without the authorization of API. To view a listing of these products pleaseclick here



  • 二手车油有许多实用用途。主要用途是将其恢复为润滑油的基础库存。这个过程与原油精炼非常相似。结果是重合石油与初榨油产品一样高。
  • 二次使用的油是用来烧掉它energy. Large industrial boilers can efficiently burn the used oil with minimum pollution. As a result some used oil is sent to power plants or cement kilns to be burned as fuel. On a smaller scale small quantities of used oil are burned in specially designed heaters to provide space heating for small businesses.

If you recycle just two gallons of used oil it can generate enough electricity to run the average household for almost 24 hours.


We are all familiar with recycling newspapers, aluminum cans, glass and plastic bottles, but you may not be aware of the efforts of the petroleum industry and other groups to promote used motor oil recycling: providing convenient collection sites for the purpose of keeping used motor oil out of our waterways and ground water supplies and getting used oil into the recycling system.

Motor oil has value even after it has been drained from an engine. The oil you take to a collection center to be recycled saves energy. It can be reprocessed and used in furnaces for heat or in power plants to generate electricity for homes, schools, and businesses. It can also be sent to a refinery that specializes in processing used oil and re-refined into lubricating base oils that can be used to formulate engine oils meeting API specifications.

What can you do?

If you change your own oil, be certain that you take it to a collection center for recycling. If you take your car to an automotive service outlet, you can be fairly certain that they recycle the oil that they change. But if you're not sure, ask.

Used motor oil that is collected by "do-it-yourselfers" is critical to the used oil recycling system. Next time you change your own oil, remember, you can make a difference by recycling the oil from your car, truck, motorcycle, boat, recreational vehicle or lawnmower. By dropping off your used motor oil today you help prevent pollution and conserve energy for a safer and healthier tomorrow.


Used Motor Oil Collection and Recycling



Collection of Used Oil Found to be Key in Conservation