The Refinery was set up at Digboi in 1901 by Assam Oil Company Limited. The Indian Oil Corporation Ltd.(IOC) took over the Refinery and marketing management of Assam Oil Company Ltd. with effect from 1981 and created a separate division. This division has both Refinery and marketing operations. The Refinery at Digboi had an installed capacity 0.50 MMTPA. The refining capacity of the Refinery was increased to 0.65 MMTPA by modernization of Refinery in July, 1996. A new delayed Coking Unit of 1,70,000 TPA capacity was commissioned in 1999. A new Solvent Dewaxing Unit for maximizing production of micro-crystalline wax was installed and commissioned in 2003. The refinery has also installed Hydrotreater to to improve the quality of diesel. Digboi is an oil town in northern Assam (in North East India). ... Alternative meanings at IOC (disambiguation) The International Olympic Committee is an organization based in Lausanne, Switzerland, created by Pierre de Coubertin in 1894 to reinstate the Ancient Olympic Games held in Greece, and organize this sports event every four years. ... 1981 (MCMLXXXI) was a common year starting on Thursday of the Gregorian calendar. ... 1996 (MCMXCVI) was a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... 1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ...