| Acheson Colloids | Addinol Lube Oil | Agip |
| Avia Mineralöl-AG | B.R Vickers & Sons | Bharat Petroleum Corporation Limited |
| Blaser Swisslube | BP/Castrol | Brugarolas |
| CARL BECHEM GMBH | Cepsa | Chevron Texaco |
| Cimcool | CITGO Petroleum | Cogelsa |
| Condat Ltd | Dow Corning Corporation | Emirates National Oil Company Limited (ENOC) |
| Exxon Mobil | Fuchs Lubricants | Gemsan |
| Gulf Lubricants | Hangsterfer's Laboratories | Henkel |
| Hermann Bantleon | Houghton International | Idemitsu Kosan |
| Indian Oil Corporation | Ironsides Lubricants | ITW/Rocol |
| Kluber Lubrication | Kuwait Petroleum International Lubricants | Liqui Moly |
| LOTOS Oil | Lukoil | Master Chemical |
| Millers Oils | MOL | Morris Lubricants |
| Motul | Neste Oil | Nippon Oil Corporation |
| Oemeta Chemische Werke | OKS Spezialschmierstoffe | OMV |
| Opet | ORLEN OIL | Petro-Canada Lubricants |
| PetroChina | Petrofer | Petrol Ofisi |
| Petroliam Nasional Berhad (PETRONAS) | Prista Oil | Quaker Chemical |
| Red Giant Oil Company | Repsol | Rhenus Lub |
| Royal Purple | Schaeffer Manufacturing Company | Shell |
| Sinopec | Statoil | Tedex Oil |
| TOTAL | Valvoline Oil Company | Zeller+Gmelin |