Chevron Corporation (US), Exxon Mobil Corporation (US), S-OIL Corporation (South Korea), Motiva Enterprises LLC (US), SK innovation Co., Ltd. (South Korea), Royal Dutch Shell plc (Netherlands), Neste Oyj (Finland), AVISTA OIL AG (Germany), Nynas AB (Sweden), Repsol S.A. (Spain), Ergon, Inc. (US), Calumet Specialty Products Partners, L.P. (US), H&R Group (Germany), Sinopec Corp. (China), PetroChina Company Limited (China), Saudi Aramco (Saudi Arabia), Abu Dhabi National Oil Company (ADNOC) (UAE), PT Pertamina (Persero) (Indonesia), Phillips 66 (US), Petroliam Nasional Berhad (PETRONAS) (Malaysia), GRUPA LOTOS S.A. (Poland), Sepahan Oil (Iran), GS Caltex Corporation (South Korea), and Hindustan Petroleum Corporation Limited or HPCL (India) are some of the leading players operating in the base oil market.