May 2, 2012. Marathon Petroleum Corp. (MPC) is exploring the possibility of reversing a major pipeline to bring oil from the Midwest to the Gulf Coast refining belt. Changing direction of the 1.2 million barrel-a-day Capline pipeline would be the second major pipeline reversal that could transport a glut of crude oil in the Midwest to the Gulf Coast, where it can be refined into petroleum products like gasoline or easily transported elsewhere. Enbridge Inc. and Enterprise Products Partners plan to reverse the 150,000 barrel-a-day Seaway pipeline within a month and expand its capacity to 400,000 barrels a day by 2013.