AMENDMENT NO. 1 TO NOTEPURCHASE AGREEMENT

Exhibit 10.1

EXECUTION VERSION

AMENDMENT NO. 1

TO

NOTE PURCHASE AGREEMENT

THIS AMENDMENT NO. 1 TO NOTE PURCHASE AGREEMENT (this “Amendment”) dated as of March 18, 2013, is entered into among Navistar Financial Securities Corporation, as the Seller (the “Seller”), Navistar Financial Corporation, as the Servicer (the “Servicer”), The Bank of Nova Scotia (“BNS”), as a Managing Agent and as a Committed Purchaser, Liberty Street Funding LLC (“Liberty Street”), as a Conduit Purchaser, Credit Suisse AG, New York Branch (“CS NYB”), as a Managing Agent, Credit Suisse AG, Cayman Islands Branch (“CS CIB”), as a Committed Purchaser, Alpine Securitization Corp. (“Alpine”), as a Conduit Purchaser, and Bank of America, National Association (“Bank of America”; together with BNS, Liberty Street, CS NYB, CS CIB and Alpine, the “Purchaser Parties”), as Administrative Agent (in such capacity, the “Administrative Agent”), as a Managing Agent and as a Committed Purchaser.

R E C I T A L S

A. The parties hereto are parties to that certain Note Purchase Agreement dated as of August 29, 2012 (the “Agreement”).

B. Pursuant to Sections 2.04 and 11.01 of the Agreement, the parties to the Agreement desire to extend the Scheduled Purchase Expiration Date by amending the Agreement as hereafter set forth.

C. NOW THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

1. Amendment to Agreement. By their signatures hereto, each of the parties hereto hereby agrees that the definition of “Scheduled Purchase Expiration Date” in Section 1.01 of the Agreement is hereby amended to replace the date “August 26, 2013” set forth therein with the date “March 13, 2014”.

2. Representations and Warranties. The Seller hereby represents and warrants to each of the Purchaser Parties that, after giving effect to this Amendment, no potential Early Redemption Event or Early Redemption Event has occurred and is now continuing, and NFC hereby represents and warrants to each of the Purchaser Parties that, after giving effect to this Amendment, no potential Early Redemption Event, Early Redemption Event or Servicer Termination Event has occurred and is now continuing.

3. Effect of Amendment. All provisions of the Agreement, as amended by this Amendment, remain in full force and effect. After this Amendment becomes effective, all references in the Agreement to “this Agreement”, “hereof”, “herein” or words of similar effect referring to the Agreement in the Agreement or in any other document relating to the Seller’s securitization program shall be deemed to be references to the Agreement as amended by this Amendment. This Amendment shall not be deemed to expressly or impliedly waive, amend or supplement any provision of the Agreement other than as set forth herein.

4. Conditions Precedent. The effectiveness of this Amendment is subject to (i) receipt (whether by e-mail, facsimile or otherwise) by the Administrative Agent of counterparts of this Amendment executed by each of the other parties hereto, (ii) receipt by the Administrative Agent of a certificate of the Seller and of the Servicer, each dated the date hereof, as to due execution, incumbency, good standing and other customary corporate matters and (iii) satisfaction of each of the conditions precedent described in Section 2.04 of the Agreement.

5. Counterparts. This Amendment may be executed in any number of counterparts and by different parties on separate counterparts, and each counterpart shall be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument.

6. Governing Law. This Amendment shall be governed by, and construed in accordance with, the internal laws of the State of New York without regard to any otherwise applicable principles of conflicts of law.

7. Section Headings. The various headings of this Amendment are inserted for convenience only and shall not affect the meaning or interpretation of this Amendment or the Agreement or any provision hereof or thereof.

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2

IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their respective officers thereunto duly authorized, as of the date first above written.

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Commitment $225,000,000

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Commitment $125,000,000

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