ISLAMABAD: The government has asked all six oil refining facilities in the country to provide full details of Deemed Duty( DD) collected on petroleum products since its inception two decades ago along with third party audits of its utilisation.In a letter, the Petroleum Division has asked managing directors of six major refineries — Pak Arab Refinery Ltd, National Refinery Ltd, Pakistan Refinery Ltd, Byco, Attock Refinery Ltd and Enar Petroleum Refining Facility — to provide within two days the