SINGAPORE- Abu Dhabi National Oil Company (ADNOC) has set the first retroactive official selling price (OSP) for a new crude grade Umm Lulu in October at $81.80 a barrel, it said late on Monday.

* That puts the October Umm Lulu OSP at $2.41 per barrel premium to the average of Dubai quotes for the month

(Reporting by Florence Tan; Editing by Gopakumar Warrier) ((Florence.Tan@thomsonreuters.com; +65 6870 3497; Reuters Messaging: florence.tan.thomsonreuters.com@reuters.net))