NEW YORK, Aug. 11 (Xinhua) -- Oil prices edged up on Friday as dollar weakened, but posted second straight weekly lost as global glut persists.

The West Texas Intermediate for September Delivery added 0.23 U.S. dollar to settle at 48.82 dollars a barrel on the New York Mercantile Exchange, while Brent crude for October delivery gained 0.20 dollar to close at 52.10 dollars a barrel on the London ICE Futures Exchange.