Oil prices dipped on Thursday on doubts producers would fully deliver on promises to cut output, although record U.S. automobile sales and falling crude stocks offered markets some support. Brent crude futures, the international benchmark for oil prices, were trading at $56.28 per barrel at 0150 GMT (8.50 p.m. ET), down 18 cents from their last close. Traders said the decline came on the back of worries that plans by the Organization of the Petroleum Exporting Countries (OPEC) and other leading producers to cut crude supply would be fully implemented. “There remains a question mark over whether OPEC, with a long history of non-compliance, will actually follow through (with the cuts). Very few respondents expect full compliance,” Singapore Exchange (SGX) said on Thursday, citing results from a survey of its participants. “Three […]