Oil Marketing Companies (OMCs) have indicated they will push for further increases in their margins despite the marginal increase last week.The National Petroleum Authority last Friday reviewed the margins enjoyed by OMCs on petroleum products.About 60 percent of these products on the market are brought in and sold by these companies because of some difficulties TOR is currently facing.Coordinator of OMCs, Kweku Agyeman Duah has told JOYBUSINESS though they welcome the increase, they will still push for further adjustments in order to stay in business.The Oil marketing companies currently enjoy about seven percent on every liter of fuel sold at the pumps. They have indicated they risk getting out of business because their margins are not adequate to cover their cost and investments.