Abu Dhabi National Oil Company (Adnoc) raised the April retroactive selling price of its benchmark Murban crude by $8.15 per barrel to $120.70, Adnoc said on Monday. The March official selling price (OSP) for Murban was $112.55 a barrel. Adnoc set the OSPs for Lower Zakum and Umm Shaif at 120.70 per barrel and $120.20 per barrel respectively.