Akhir 12, 1432 / March 17, 2011, SPA -- The oil price of the Organization of the Petroleum Exporting Countries (OPEC) slid further toward the 105-dollar mark at mid-week, the group said Thursday, according to dpa. OPEC's basket price settled at 105.80 dollars per barrel (159 litres) on Wednesday, down 0.76 dollars from the day before. The cartel's price moved counter to rising benchmark brands in Europe and the United States.