2013-03-04 19:38:14 -

FINDLAY, Ohio, March 4, 2013 - MPLX LP (NYSE: MPLX) today announced that the
company's 2012 investor tax packages are now available on its website,
www.mplx.com. Investors may select the Tax Reporting Package link under the
Investor tab, or use the link provided:
www.mplx.com/Investors/Tax_Reporting_Package/.

Additionally, MPLX has begun mailing tax packages today, and will complete all
mailings by March 8, 2013. Questions regarding the Tax Reporting Package can be
addressed by contacting (855) 375-4157 (toll free) or via email at
MPLXK1Help@deloitte.com.



                                      ###


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


MPLX 2012 K-1: 
 hugin.info/155038/R/1682723/550537.pdf



This announcement is distributed by Thomson Reuters on behalf of 
Thomson Reuters clients. The owner of this announcement warrants that: 
(i) the releases contained herein are protected by copyright and 
    other applicable laws; and 
(ii) they are solely responsible for the content, accuracy and 
     originality of the information contained therein. 
    
Source: MPLX LP via Thomson Reuters ONE
[HUG#1682723]