MPLX LP 2013 K-1 Tax Packages Now Available on Company Website

FINDLAY, Ohio, March 3, 2014 - MPLX LP (NYSE: MPLX) today announced that the company's 2013 investor tax packages are now available on its website, http://www.mplx.com. Investors may select the Tax Reporting Package link under the Investor tab, or use the link provided: http://www.mplx.com/Investors/Tax_Reporting_Package/.

Additionally, MPLX has begun mailing tax packages today, and will complete all mailings by March 7, 2014. Questions regarding the Tax Reporting Package can be addressed by contacting 855-375-4157 (toll free) or via email at MPLXK1Help@deloitte.com.

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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. For additional information about the company, please see our website at http://www.mplx.com.

Investor Relations Contacts:
Beth Hunter (419) 421-2559
Geri Ewing (419) 421-2071