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[en] This study examines the time series behaviour of oil production for OPEC member countries within a fractional integration modelling framework recognizing the potential for structural breaks and outliers. The analysis is undertaken using monthly data from January 1973 to October 2008 for 13 OPEC member countries. The results indicate there is mean reverting persistence in oil production with breaks identified in 10 out of the 13 countries examined. Thus, shocks affecting the structure of OPEC oil production will have persistent effects in the long run for all countries, and in some cases the effects are expected to be permanent. - Research Highlights: →Mean reverting persistence in oil production with breaks identified in 10 out of the 13 countries examined. → Standard analysis based on cointegration techniques and involving oil production should be examined in the more general context of fractional cointegraton. → Analysis of outliers did not alter the main conclusions of the study.