MPLX LP : MPLX LP Increases Quarterly Distribution

              MPLX LP : MPLX LP Increases Quarterly Distribution

FINDLAY, Ohio, April 30, 2013 - MPLX LP (NYSE: MPLX) today announced a cash
distribution of $0.2725 per common unit for the first quarter of 2013. This
represents an increase of $0.01 per common unit above the minimum quarterly
distribution. The distribution will be paid May 17, 2013, to unitholders of
record May 10, 2013.

This release is intended to be a qualified notice under Treasury Regulation
Section 1.1446-4(b). Brokers and nominees should treat 100 percent of MPLX's
distributions to foreign investors as being attributable to income that is
effectively connected with a United States trade or business. Accordingly,
MPLX's distributions to non-United States investors are subject to federal
income tax withholding at the highest applicable effective tax rate.

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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 majority 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.

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

MPLX XP Distribution

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information contained therein.

Source: MPLX LP via Thomson Reuters ONE
HUG#1697645
 
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