1. BASF SE
2. BP PLC
3. Castrol Limited
4. CCI Corporation
5. Chevron Corporation
6. China Petroleum & Chemical Corporation
7. Cummins Inc.
8. Dow Inc.
9. Evans Cooling Systems Inc.
10. Exxon Mobil Corporation
11. Halfords Group PLC
12. Indorama Ventures Public Company Limited
13. Motul S.A.
14. Petroliam Nasional Berhad
15. PJSC Lukoil Oil Company
16. Prestone Products Corporation
17. Recochem Inc.
18. Rock Oil Company
LLC
19. Royal Dutch Shell PLC
20. Sonax GmbH
21. Valvoline Inc.