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Digboi is a town and a town area committee in Tinsukia district in the north-eastern part of the state of Assam, India. Crude oil was discovered here in late 19th century. Digboi is known as the Oil City of Assam where the first oil well in Asia was drilled. The first refinery was started here as early as 1901. The Digboi Refinery is India's oldest refinery. Originally a part of Assam Oil Company, it became part of Indian Oil in 1981. Its original refining capacity had been 0.5 MMTPA since 1901. After modernization the capacity of the refinery has been enhanced to 0.62 MMTPA. The Digboi refinery produces distillates, heavy ends and excellent quality wax from indigenous crude oil produced at the Assam oil fields. The refinery presently produces MS and HSD complying BS-III grade.