SINGAPORE, Nov 30 (Reuters) - Taiwanese refiner Formosa Petrochemical Corp has bought 12 million barrels of Iraqi Basra Light crude for delivery in 2016 in a tender, traders said on Monday.

The six cargoes were sold by a major oil company at 40-50 cents a barrel below the grade's official selling price (OSP) during the delivery month before freight, one source said.

Formosa will notify the seller of the delivery month.

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