- Amsoil Inc.
- BASF SE
- Bharat Petroleum Corporation Limited
- BP PLC
- Blaser Swisslube AG
- Carl Bechem GmbH
- China National Petroleum Corporation (PetroChina)
- China Petroleum & Chemical Corporation (Sinopec)
- Chevron Corporation (Including Caltex)
- Eni SpA
- Exxon Mobil Corporation
- FUCHS
- Gazprom Neft PJSC
- Gulf Oil Corporation Limited
- HPCL
- Idemitsu Kosan Co. Ltd
- Indian Oil Corporation Ltd
- Illinois Tool Works Inc. (ROCOL)
- JX Nippon Oil & Energy Corporation
- Kluber Lubrication
- Lukoil Lubricants Company
- Motul
- PT Pertamina (Persero)
- Petrobras
- Petrofer Chemie HR Fischer GmbH + Co. KG
- Petromin Corporation
- Petronas Lubricants International
- Phillips 66 Lubricants
- Repsol
- Royal Dutch Shell PLC
- SK Lubricants Co. Ltd
- Veedol International Limited
- Total Lubricants
- Valvoline LLC