In the context of oil, API most commonly refers to the American Petroleum Institute (API). This organization plays a crucial role in setting industry standards, particularly for engine oils.
API's Role in Engine Oil Standards
The API establishes performance standards for motor oils used in both gasoline and diesel engines. These standards ensure oils meet specific quality and performance requirements, supporting the latest engine technologies. The API designates different categories and classifications for engine oils, indicating their suitability for various engine types and applications. For example, an oil labeled with an API service category signifies it meets the performance properties outlined for that specific category (see API's Oil Categories page for details). Older engine types might require specific API grades like API CC, which may be less common in modern vehicles (as seen in this discussion on narrowboat engines). The API specifications ensure compatibility and optimal performance for various engines.
API Gravity: Measuring Oil Density
Another meaning of API in the oil industry refers to API gravity, a measure of how heavy or light a petroleum liquid is compared to water. A higher API gravity indicates a lighter oil (see API Gravity on Wikipedia). This measurement is important for various aspects of oil refining and trading.
API Numbers for Oil and Gas Wells
The API also assigns unique numbers to every oil and gas well in the United States. These numbers, known as API numbers, are crucial for tracking and identifying wells, facilitating regulatory oversight and resource management (API Number Explanation from West Virginia Department of Environmental Protection). These numbers differ significantly from the API classifications used for engine oil.
In Summary: Different Contexts, Same Acronym
The acronym API in the oil industry can refer to different, yet related, concepts:
- American Petroleum Institute (API): The organization setting standards for engine oils and other aspects of the petroleum industry.
- API Gravity: A measure of the density of petroleum liquids.
- API Well Numbers: Unique identifiers for oil and gas wells.
