Global benchmark Brent crude futures were down 48 cents at $48.76 a barrel by 12:06pm GMT, but still around 6% higher than before Wednesday's Opec agreement.
US crude was down 18 cents at $47.65 a barrel, also about 6% higher than before the Opec deal.
The dollar rose against a basket of currencies, making it more expensive for investors to hold dollar-denominated commodities such as oil.
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