SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 18)*

Navistar International Corporation

(Name of Issuer)

Common Stock, Par Value $0.10

(Title of Class of Securities)

63934E108

(CUSIP Number)

Andrew Langham, Esq.

Icahn Capital LP

767 Fifth Avenue, 47^th Floor

New York, New York 10153

(212) 702-4300

(Name, Address and Telephone Number of Person Authorized to

Receive Notices and Communications)

December 18, 2015

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box / /.

NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d‑7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

Item 1. Security and Issuer

This statement constitutes Amendment Number 18 to the Schedule 13D relating to the Common Stock, par value $0.10 (the "Shares"), issued by Navistar International Corporation (the "Issuer"), and hereby amends the Schedule 13D filed with the Securities and Exchange Commission on September 13, 2011, as amended by Amendment Number 1 to Schedule 13D, filed with the SEC on November 2, 2011, by Amendment Number 2 to the Schedule 13D, filed with the SEC on November 15, 2011, by Amendment Number 3 to the Schedule 13D, filed with the SEC on December 6, 2011, by Amendment Number 4 to the Schedule 13D, filed with the SEC on June 8, 2012, by Amendment Number 5 to the Schedule 13D, filed with the SEC on July 11, 2012, by Amendment Number 6 to the Schedule 13D, filed with the SEC on July 24, 2012, by Amendment Number 7 to the Schedule 13D, filed with the SEC on September 10, 2012, by Amendment Number 8 to the Schedule 13D, filed with the SEC on September 11, 2012, by Amendment Number 9 to the Schedule 13D, filed with the SEC on October 9, 2012, by Amendment Number 10 to the Schedule 13D, filed with the SEC on October 25, 2012, by Amendment Number 11 to the Schedule 13D, filed with the SEC on December 10, 2012, by Amendment Number 12 to the Schedule 13D, filed with the SEC on July 15, 2013, by Amendment Number 13 to the Schedule 13D, filed with the SEC on July 17, 2013, by Amendment Number 14 to the Schedule 13D, filed with the SEC on July 19, 2013, by Amendment Number 15 to the Schedule 13D, filed with the SEC on April 15, 2014, by Amendment Number 16 to the Schedule 13D, filed with the SEC on June 24, 2014, and by Amendment Number 17 to the Schedule 13D, filed with the SEC on December 17, 2014 (collectively, the "Schedule 13D"), each on behalf of the Reporting Persons, to furnish the additional information set forth herein. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Schedule 13D.

Item 4.  Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended by adding the following:

Certain of the Reporting Persons and certain entities affiliated with MHR Fund Management LLC (the "MHR Entities") intend to consult and/or coordinate with each other in connection with their respective potential purchases of non-convertible debt of the Issuer.  Such consultation and/or coordination may continue until either the Reporting Persons or the MHR Entities no longer wish to do so.

None of the Reporting Persons nor any of the MHR Entities possess any voting or dispositive power or control over the shares of voting common stock of the Issuer held by the other person or its affiliates.  Each Reporting Person expressly disclaims beneficial ownership of the securities of the Issuer beneficially held by the MHR Entities.  None of the Reporting Persons have entered into any agreement, arrangement or understanding, nor agreed to act together with any MHR Entity or their affiliates, or any other person, for the purpose of acquiring, holding, voting or disposing of any equity securities of the Issuer.

Item 6.  Contracts, Arrangements, Understandings or Relationship with Respect to Securities of the Issuer

Item 6 of the Schedule 13D is hereby amended by adding the following:

The disclosure set forth under Item 4 above is incorporated herein by reference.

SIGNATURE

After reasonable inquiry and to the best of each of the undersigned knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: December 18, 2015

ICAHN PARTNERS MASTER FUND LP

ICAHN OFFSHORE LP

ICAHN PARTNERS LP

ICAHN ONSHORE LP

BECKTON CORP.

HOPPER INVESTMENTS LLC

BARBERRY CORP.

HIGH RIVER LIMITED PARTNERSHIP

By: Hopper Investments LLC, general partner

By: Barberry Corp., its sole member

  Name: Edward E. Mattner

  Title: Authorized Signatory

ICAHN CAPITAL LP

By: IPH GP LLC, its general partner

By: Icahn Enterprises Holdings L.P., its sole member

By: Icahn Enterprises G.P. Inc., its general partner

IPH GP LLC

By: Icahn Enterprises Holdings L.P., its sole member

By: Icahn Enterprises G.P. Inc., its general partner

ICAHN ENTERPRISES HOLDINGS L.P.

By: Icahn Enterprises G.P. Inc., its general partner

ICAHN ENTERPRISES G.P. INC.

Name: Sung Hwan Cho

Title: Chief Financial Officer

/s/ Carl C. Icahn_____________

CARL C. ICAHN

[Signature Page of Schedule 13D –

Navistar International Corporation Amendment No. 18]