GABORONE, March 26( Xinhua)--Botswana Oil Limited announced on Tuesday that multinational oil companies will be banned from importing petroleum products into Botswana from April 1. According to the new mandate, 90 percent of fuel imports required for Botswana shall be imported by Botswana Oil Limited, while 10 percent will remain imported by locally owned companies." This new mandate will trim the dominance and prevalence of multinationals in the sector, creating investment opportunities for loc