Markwest Energy Partners : MPLX to Announce 2016 First-Quarter Financial Results April 28

FINDLAY, Ohio, March 30, 2016 - MPLX LP (NYSE: MPLX), a master limited partnership sponsored by Marathon Petroleum Corporation (NYSE: MPC), will host a conference call on Thursday, April 28, at 11 a.m. EDT to discuss 2016 first-quarter financial results, which will be released earlier that day, and to provide an update on partnership operations.

MPLX participants will be Gary R. Heminger, chairman and chief executive officer; Donald C. Templin, president; Nancy K. Buese, executive vice president and chief financial officer; and other senior executives. The call will be hosted by Lisa Wilson, director of investor relations.

Interested parties may listen to the conference call by dialing 1-800-446-1671 (confirmation #42124992) or by visiting MPLX's website at http://www.mplx.com and clicking on the '2016 First-Quarter Financial Results' link in the 'News & Headlines' section. Financial information, including the earnings release and other investor-related material, also will be available online. Replays of the conference call will be available on the partnership's website through Wednesday, May 11.

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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 network of common carrier crude oil and products pipeline assets located in the Midwest and Gulf Coast regions of the United States and a butane storage cavern located in West Virginia with approximately 1 million barrels of natural gas liquids storage capacity. In addition, MarkWest Energy Partners, L.P., a wholly owned subsidiary of MPLX, owns and operates midstream service businesses. MarkWest has a leading presence in many natural gas resource plays, including the Marcellus Shale, Utica Shale, Huron/Berea Shale, Haynesville Shale, Woodford Shale and Granite Wash formation.

Investor Relations Contacts:
Lisa D. Wilson [phone]
Teresa Homan [phone]
Kevin Hawkins [phone]

Media Contact:
Chuck Rice [phone]
Brandon Daniels [phone]

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