1. Ashland Inc.
2. Castrol Limited by BP PLC
3. Chevron Corporation
4. China Petroleum & Chemical Corporation
5. DANA Lubricants Factory LLC
6. Exxon Mobil Corporation
7. Fuchs Petrolub SE
8. GP Petroleums Ltd.
9. Motul S.A.
10. Panama Petrochem Ltd.
11. Pentagon Lubricants
12. Perstorp Holding AB
13. Petroleum Nasional Berhad
14. Saudi Aramco Base Oil Company
15. Shell PLC
16. Total Lubrifiants SA
17. W?rth Group