Donald C. Templin Named Executive Vice President and Timothy T. Griffith Named Vice President and Chief Financial Officer and Elected Director of the General Partner of MPLX LP

FINDLAY, Ohio, March 3, 2015 - MPLX LP (NYSE: MPLX) announced a series of leadership changes today.

Donald C. Templin has been named executive vice president of the general partner of MPLX and continues to serve as a director. He previously served as vice president and chief financial officer.

Timothy T. Griffith has been named vice president and chief financial officer of the general partner of MPLX and will continue to serve as treasurer. Griffith has also been elected to the board of directors of the general partner of MPLX. In addition to treasurer, he previously served as vice president, Finance and Investor Relations, and he will retain those responsibilities.

Additionally, John S. Swearingen has been named vice president and chief operating officer of the general partner of MPLX, replacing George P. Shaffner, who served in that role since the partnership's initial public offering in 2012. Shaffner has assumed a new executive position at Marathon Petroleum Corporation and will no longer serve as an officer of the general partner of MPLX.

Gary R. Heminger, MPLX chairman and chief executive officer, said "Templin's, Griffith's and Swearingen's primary role at MPLX will be to support Pamela K. M. Beall, MPLX president, as she guides MPLX through its accelerated growth strategy."

These leadership changes are effective immediately.

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About MPLX LP

MPLX is a fee-based, growth-oriented master limited partnership formed in 2012 by Marathon Petroleum Corporation to own, operate, develop and acquire pipelines and other midstream assets related to the transportation and storage of crude oil, refined products and other hydrocarbon-based products. Headquartered in Findlay, Ohio, MPLX's assets consist of a 99.5 percent equity interest in a network of common carrier crude oil and products pipeline assets located in the Midwest and Gulf Coast regions of the United States and a 100 percent interest in a butane storage cavern located in West Virginia, with approximately 1 million barrels of Natural Gas liquids storage capacity.

Investor Relations Contacts:
Geri Ewing (419) 421-2071
Teresa Homan (419) 421-2965

Media Contact:
Chuck Rice (419) 421-2521