The price for oil produced by the Organization of the Petroleum Exporting Countries (OPEC) shed 0.51 dollars Thursday, the Vienna-based cartel announced Friday.
One barrel (159 litres) of OPEC-produced crude stood at 41.79 dollars Thursday, dpa reported.
This week's downward trend nearly offset gains earlier this month, when one barrel climbed to 43.85 dollars on February 9.
OPEC calculates its basket price based on 12 brands produced by its members.