Oil prices dipped on Tuesday as disagreement flared within producer cartel OPEC on who should cut how much production in a planned coordinated reduction to prop up prices.
The dollar, which held near nine-month highs against a basket of major currencies, also weighed on prices. A strong dollar makes greenback-denominated commodities including oil more expensive for holders of other currencies.
International Brent crude oil futures fell 8 cents to $51.38 per barrel as of 0528 GMT from their last close.
