Oil prices dipped on Friday as the U.S. dollar strengthened, although OPEC-led supply cuts are seen supporting markets going into next year. US West Texas Intermediate (WTI) crude futures were at $56.64 a barrel at 0108 GMT, down 5 cents from their last settlement. Brent crude futures, the international benchmark for oil prices, were down 11 cents at $62.09 a barrel. Traders said the slightly lower prices were mainly due to the stronger dollar, which has gained 0.8 per cent this month against a basket of other leading currencies. A stronger greenback is seen by many as a brake on crude prices, as it makes oil purchases more expensive in countries that use other currencies. “A strong US dollar could act as a headwind to commodities,” Bank of America Merrill Lynch (BoAML) said in its 2018 outlook, published this week. More fundamentally, oil prices have been receiving support from the Organization of the Petroleum Exporting Countries (OPEC) and a group of non-OPEC producers, most importantly Russia, which has been withholding supplies to tighten the market and prop up prices.