- Abu Dhabi National Oil Company
- Chevron Corporation
- China Petrochemical Corporation (Sinopec)
- CNOOC Limited
- Eni S.p.A.
- Exxon Mobil Corporation
- Formosa Petrochemical Co.
- GS Caltex Corporation
- Hainan handi Sunshine Petrochemical Co. Ltd
- HP Lubricants
- Idemitsu Kosan Co. Ltd
- Indian Oil Corporation Ltd
- LUKOIL
- NESTE
- Nynas AB
- Petrobras
- Petroliam Nasional Berhad (PETRONAS)
- Philips 66 Company
- Saudi Aramco Base Oil Company
- Sepahan Oil Company
- Shell
- SK Lubricants Co. Ltd
- S-OIL CORPORATION
- Total S.A.