1. Bharat Petroleum Corporation Limited
2. BP PLC
3. Castrol Limited
4. Chevron Corporation
5. Eni S.P.A.
6. ExxonMobil Corporation
7. Fuchs Petrolub AG
8. Gulf Oil International Ltd.
9. Idemitsu Kosan Co. Ltd
10. Indian Oil Corporation Ltd.
11. Lubrizol Ltd.
12. Lukoil
13. Royal Dutch Shell PLC
14. Sinopec Corp.
15. Valvoline Inc. by Aramco