The price for oil produced by the Organization of the Petroleum Exporting Countries (OPEC) gained slightly on Thursday but stopped short of crossing the 44-dollar mark, according to data released by OPEC today, dpa reported. One barrel (159 litres) of OPEC-produced crude stood at 43.87 dollars Thursday, 0.08 dollars higher than on the previous day. The Vienna-based oil cartel calculates a basket price based on 12 brands produced by its members.