Rourkela: Acting on a tip-off, the police busted a duplicate engine oil manufacturing unit under Bisra police limits and detained two people in Rourkela on Sundargarh district. The duplicate engine oil manufacturing unit was operating at a building in Asiyana colony. According to information, the police raided the area and seized adulterated branded engine oils. Thousands of engine oil bottles of a renowned company was seized from the manufacturing unit. The Rourkela police found that the unit was fixing used up engine oil along with the adulterated engine oil. The police detained two people in this relation.