MPLX LP to Announce 2013 First-Quarter Financial Results Apr. 30

FINDLAY, Ohio, Apr. 1, 2013 - MPLX LP (NYSE: MPLX), a master limited partnership formed by Marathon Petroleum Corporation (NYSE: MPC), announced today that it will host a conference call on Tuesday, Apr. 30, at 2 p.m. EDT to provide an update on company operations and to discuss 2013 first-quarter financial results, which will be released earlier that day.

MPLX participants will be Garry Peiffer, president; and Don Templin, vice president and chief financial officer. The call will be hosted by Pam Beall, vice president, Investor Relations.

Interested parties may listen to the conference call on MPLX's website at http://www.mplx.com by clicking on the "2013 First-Quarter Financial Results" link in the "News & Headlines" section. Replays of the conference call will be available on the company's website through Thursday, May 16.

###

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 51 percent 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.

Investor Relations Contacts:
Pamela Beall (419) 429-5640
Beth Hunter (419) 421-2559

Media Contacts:
Angelia Graves (419) 421-2703