Oil prices extended gains in Asia Wednesday on weaker dollar ahead of Fed rate decision, while analysts said the worst of a sell-off that in the beleaguered commodity has likely passed.

    A weak dollar has also provided support as it makes crude cheaper for customers using other currencies. At around 0640 GMT Wednesday WTI for delivery in June was up 53 cents, or 1.20 percent, at $44.57. Brent crude for June had risen 58 cents, or 1.27 percent, to $46.32.