The world’s top oil exporter, Saudi Arabia, has cut February’s official selling price for all grades of crude it is selling to Asia by at least $1 a barrel, three sources with knowledge of the matter said on Thursday.

State oil giant Saudi Aramco set the February OSP for Arab Light crude at $2.20 a barrel above the average of Oman/Dubai quotes, down $1.10 from the previous month, they said.

The February OSP for the flagship crude is the lowest in three months.