First Amendment to the Loan Agreement by and between MPLX LP and MPC Investment LLC, dated December 4, 2015

THIS FIRST AMENDMENT TO LOAN AGREEMENT (“Amendment”) is entered into as of April 27, 2018 by and between MPLX LP, a Delaware limited partnership (the “Borrower”), and MPC Investment LLC, a Delaware limited liability company (the “Lender”). The Borrower and the Lender may be singularly referred to as a “Party” and collectively referred to as the “Parties”.

1.    Purpose. The Parties acknowledge and agree that this Amendment is made and entered into for the purpose of modifying certain terms and/or conditions of the Loan Agreement entered into by the Parties on December 4, 2015 (the “Loan Agreement”). The terms and conditions set forth in this Amendment shall supersede and replace the provisions of the Agreement identified herein. All terms and conditions of the Loan Agreement not modified by this Amendment shall remain in full force and effect as set forth in the Loan Agreement. All capitalized terms set forth in this Amendment shall have the same meanings as set forth in the Loan Agreement.

2.    Modification. Section 2.1 of the Loan Agreement is hereby amended and replaced in its entirety with the following:

“2.1    Loans. Subject to the terms provided for in this Loan Agreement, the Lender shall from time-to-time on or after the Effective Date make loans to the Borrower on a revolving basis (each, a “Loan” and collectively, the “Loans”), as requested by the Borrower and agreed to by the Lender (in the Lender’s sole discretion), in amounts that do not result in the aggregate principal amount of all Loans outstanding exceeding One Billion U.S. Dollars ($1,000,000,000) at any one time.”

IN WITNESS WHEREOF, each of the Parties has executed this First Amendment to Loan Agreement as of the date first written above.