Certificate of quality crude oil
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 Intertek's crude oil assay labs are staffed by expert petroleum chemists with state-of-the-art instrumentation. Intertek operates the world's leading independent crude oil assay laboratory network, with the critical expertise and capabilities required for full crude oil assay assessments and detailed hydrocarbons analysis.