1. Castrol Limited
2. Chevron Corporation
3. CHS Inc
4. Condat Group
5. Cougar Lubricants International Ltd
6. Exol Lubricants Limited
7. Exxon Mobil Corporation
8. Frontier Performance Lubricants Inc.
9. Fuchs Petrolub SE
10. Gulf Oil International Ltd
11. International Products Corporation
12. Kuwait Petroleum N.V.
13. Lubrita Europe B.V.
14. Midlands Lubricants Ltd.
15. MOL Group
16. Oscar Lubricants LLC
17. Pennine Lubricants Limited
18. PETRONAS Lubricants International Sdn. Bhd.
19. Repsol Group
20. Rix Petroleum Limited
21. Rizol Petro Products Pvt. Ltd.
22. Royal Dutch Shell PLC
23. Rymax B.V.
24. Schaeffer Manufacturing Co.
25. SGS Soci?t? G?n?rale de Surveillance SA
26. Smith and Allan Ltd.
27. The Phillips 66 Group of Companies
28. Valvoline Inc.