Indian refiners Mangalore Refinery and Petrochemicals bought 1 million barrels of Oman crude via a tender, three trade ‌sources ⁠said ⁠on Wednesday.The oil was bought ​at a premium of about $3 a ​barrel to the dated Brent contract, the sources said. ​One of ⁠them added ‌that the seller ​was ​Mitsui & Co Energy Trading ⁠Singapore.ALSO READ | Indian Oil reassesses ₹33,000 crore Tamil Nadu refinery, eyes petrochemicals complexSeparately, state-run Indian Oil Corp, the country's biggest refiner by capacity, purchased four million barrels of West African crude, the sources said.The company bought Angolan ‌Nemba, Saxi Batuque and Clov as well as Congo's Djeno ⁠crude, all from Chevron, the people said.The companies typically do not ​comment on commercial trades.