Exhibit 99.1

Media Contact:	Roy Wiley, 630-753-2627
Investor Contact:	Heather Kos, 630-753-2406
Web site:	www.Navistar.com/newsroom

NAVISTAR CONTINUES ON PROFITABLE PATH DESPITE

TOUGH MARKET CONDITIONS

• 2Q Results Reflect Improved Performance of Core Business

• Navistar Reaffirms Fiscal 2010 Guidance in $2.75-$3.25 EPS Range

• 2010 MaxxForce Advanced EGR Engines Launching

WARRENVILLE, Ill. (June 9) – Navistar International Corporation (NYSE: NAV) reported solid second-quarter results as reflected by improvements in the performance of its core business as the company continues to navigate the difficult economic climate.

“Our expectations are to be profitable across the business cycle,” said Daniel C. Ustian, Navistar chairman, president and CEO. “The plans we have put in place for our core businesses are on track through the second quarter. We are confident that the foundation is in place to continue to support our profitability and grow our business.”

Even though the industry is at a nearly 50-year low, net income attributable to Navistar International Corporation for the second quarter ended April 30, 2010, was $30 million, equal to $0.42 of diluted earnings per share. As previously reported, earnings for its fiscal year ending Oct. 31, 2010, are expected to be in the range of $2.75 to $3.25 per diluted share. Revenues for the second quarter totaled $2.7 billion.

“We remain confident for the remainder of the year about our ability to deliver fiscal 2010 results in the previously reported range,” said Ustian. “The orders we have received for our 2010-compliant products ensure that the business is well positioned for the rest of the year.”

The company said it is prepared for a successful launch of its MaxxForce^® Advanced EGR (exhaust gas recirculation) engines as it continues on its path to meet the latest emissions requirements. During the quarter, key regulatory certifications were obtained for 2010 MaxxForce^® 13 and MaxxForce^® DT Advanced EGR big bore diesel and mid-range diesel engines.

Other significant milestones achieved in the quarter included improvements in Navistar’s cost structure, which were achieved through reductions in material costs and rationalization of its North American plants to create cost efficiencies in its Class 8 heavy truck and school bus production lines. The company also completed a retail funding alliance with GE Capital

Corporation and GE Capital Commercial, Inc. in which GE will become the preferred source of retail customer financing for equipment offered by the company and its dealers in the United States to help it grow sales of trucks and school buses.

During the quarter, the company also began shipping a limited number of International^® MaxxPro^® Dash Mine Resistant Ambush Protected (MRAP) vehicles that include the DXM™ independent suspension solution, which were part of an order Navistar received in January from the U.S. military.

Summary Financial Results

	Second Quarter					Six Months
	2010		2009			2010		2009
(Dollars in Millions, except per share data)
Sales & Revenues	$	2,743	$	2,808		$	5,552	$	5,778
Segment Results
Truck		76		56			111		170
Engine		15		(84	)		69		105
Parts		58		115			137		219
Manufacturing Segment Profit		149		87			317		494
Income Before Taxes		33		21			71		248
Net Income Attributable to Navistar International Corporation		30		12			47		246
Diluted Earnings Per Share Attributable to Navistar International Corporation		0.42		0.16			0.65		3.44

See SEC Regulation G for additional information.

Total net income for the second quarter a year ago was $12 million, equal to $0.16 of diluted earnings per share, including the impact of costs related to the Ford settlement. For the first six months of fiscal 2010, net income was $47 million, equal to $0.65 of diluted earnings per share, compared with year-ago six months net income of $246 million, equal to $3.44 of diluted earnings per share, including the favorable effects from the settlement with Ford.

Segment Results

Truck — For the second quarter ended April 30, 2010, the truck segment realized a profit of $76 million, compared with a year-ago second quarter profit of $56 million, which included substantial U.S. military sales as part of its MRAP vehicle program. The increase was driven primarily by improved commercial performance and continued material and manufacturing cost improvements offset partially by lower military sales. Commercial chargeouts in its traditional North American Class 6-8 truck and school bus business increased by 29 percent for the second quarter and 15 percent for the six-month period. Also contributing to the increase was the value added tax recovery of $30 million in Brazil.

Engine — The engine segment had a $15 million profit in the 2010 second quarter, which reflects increased demand in Brazil and the value added tax recovery of $12 million in Brazil, partially offset by decreased volumes in North America due to the expiration of the company’s contract with Ford to supply diesel engines in the United States and Canada. This is compared with a year-ago second quarter loss of $84 million, which was impacted by the Ford settlement and other related charges as the company began to transition out of its business with Ford. Other factors contributing to second-quarter profit included a 54 percent increase in South American engine shipments over the year-ago second quarter, the impact of consolidation of the company’s Blue Diamond Parts operations and increased intercompany activity aided by sales of its 11-liter and 13-liter MaxxForce engines.

Parts — The parts segment continues to deliver profits due to increased volumes in business in North America, which partially offset the impact of declines in U.S. military sales. The parts segment reported a second-quarter profit of $58 million, compared with a year-ago profit of $115 million, which was positively impacted by strong MRAP volumes.

Financial Services — The financial services segment delivered a profit of $16 million and $28 million, in the second quarter and six months ended April 30, 2010, respectively, compared with a profit of $18 million and $17 million in the year-ago second quarter and six month periods. The second-quarter results were positively impacted by the benefits of decreased interest expense and lower derivative expense offset by a decrease in revenues, as a result of declines in average receivable balances as the economic climate remains challenging to the company’s customers and dealers.

About Navistar

Navistar International Corporation (NYSE: NAV) is a holding company whose subsidiaries and affiliates produce International^® brand commercial and military trucks, MaxxForce^® brand diesel engines, IC Bus™ brand school and commercial buses, Monaco RV brands of recreational vehicles, and Workhorse^® brand chassis for motor homes and step vans. The company also provides truck and diesel engine service parts. Another affiliate offers financing services. Additional information is available at www.Navistar.com/newsroom.

Forward-Looking Statement

Information provided and statements contained in this report that are not purely historical are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, Section 21E of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of 1995. Such forward-looking statements only speak as of the date of this report and the company assumes no obligation to update the information included in this report. Such forward-looking statements include information concerning our possible or assumed future results of operations, including descriptions of our business strategy. These statements often include words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “estimate,” or similar expressions. These statements are not guarantees of performance or results and they involve risks, uncertainties, and assumptions. For a further description of these factors, see Item 1A, Risk Factors of our Form 10-K for the fiscal year ended October 31, 2009, which was filed on December 21, 2009. Although we believe that these forward-looking statements are based on reasonable assumptions, there are many factors that could affect our actual financial results or results of operations and could cause actual results to differ materially from those in the forward-looking statements. All future written and oral forward-looking statements by us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to above. Except for our ongoing obligations to disclose material information as required by the federal securities laws, we do not have any obligations or intention to release publicly any revisions to any forward-looking statements to reflect events or circumstances in the future or to reflect the occurrence of unanticipated events.

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Navistar International Corporation and Subsidiaries

Consolidated Statements of Operations

(Unaudited)

	Three Months Ended April 30,						Six Months Ended April 30,
	2010			2009			2010			2009
(in millions, except per share data)
Sales and revenues
Sales of manufactured products, net	$	2,690		$	2,741		$	5,448		$	5,636
Finance revenues		53			67			104			142
Sales and revenues, net		2,743			2,808			5,552			5,778
Costs and expenses
Costs of products sold		2,189			2,295			4,451			4,618
Restructuring charges		3			(3	)		(14	)		55
Selling, general and administrative expenses		372			300			710			676
Engineering and product development costs		116			130			225			238
Interest expense		64			57			131			150
Other (income) expense, net		(47	)		22			(41	)		(176	)
Total costs and expenses		2,697			2,801			5,462			5,561
Equity in (loss) income of non-consolidated affiliates		(13	)		14			(19	)		31
Income before income tax benefit (expense)		33			21			71			248
Income tax benefit (expense)		10			(9	)		2			(2	)
Net income		43			12			73			246
Net income attributable to non-controlling interests		(13	)		—			(26	)		—
Net income attributable to Navistar International Corporation	$	30		$	12		$	47		$	246
Earnings per share attributable to Navistar International Corporation:
Basic	$	0.43		$	0.16		$	0.66		$	3.45
Diluted		0.42			0.16			0.65			3.44
Weighted average shares outstanding:
Basic		71.4			70.8			71.3			71.2
Diluted		72.8			71.3			72.4			71.5

Navistar International Corporation and Subsidiaries

Consolidated Balance Sheets

	April 30, 2010			October 31, 2009
(in millions, except per share data)	(Unaudited)			(Revised)
ASSETS
Current assets
Cash and cash equivalents	$	508		$	1,212
Marketable securities		175			—
Trade and other receivables, net		754			855
Finance receivables, net		1,420			1,706
Inventories		1,719			1,666
Deferred taxes, net		106			107
Other current assets		240			202
Total current assets		4,922			5,748
Restricted cash and cash equivalents		284			485
Trade and other receivables, net		38			26
Finance receivables, net		1,400			1,498
Investments in non-consolidated affiliates		97			62
Property and equipment (net of accumulated depreciation and amortization of $1,850 and $1,765, at the respective dates)		1,439			1,467
Goodwill		324			318
Intangible assets (net of accumulated amortization of $112 and $101, at the respective dates)		272			264
Deferred taxes, net		44			52
Other noncurrent assets		120			103
Total assets	$	8,940		$	10,023
LIABILITIES, REDEEMABLE EQUITY SECURITIES AND STOCKHOLDERS’ DEFICIT
Liabilities
Current liabilities
Notes payable and current maturities of long-term debt	$	1,006		$	1,136
Accounts payable		1,600			1,872
Other current liabilities		1,065			1,177
Total current liabilities		3,671			4,185
Long-term debt		3,539			4,156
Postretirement benefits liabilities		2,203			2,570
Deferred taxes, net		170			142
Other noncurrent liabilities		555			599
Total liabilities		10,138			11,652
Redeemable equity securities		11			13
Stockholders’ deficit
Series D convertible junior preference stock		4			4
Common stock ($0.10 par value per share, 110.0 shares authorized, 71.2 and 75.4 shares issued at the respective dates)		7			7
Additional paid in capital		2,195			2,181
Accumulated deficit		(2,025	)		(2,072	)
Accumulated other comprehensive loss		(1,311	)		(1,674	)
Common stock held in treasury, at cost (4.1 and 4.7 shares, at the respective dates)		(135	)		(149	)
Total stockholders’ deficit attributable to Navistar International Corporation		(1,265	)		(1,703	)
Stockholders’ equity attributable to non-controlling interests		56			61
Total stockholders’ deficit		(1,209	)		(1,642	)
Total liabilities, redeemable equity securities, and stockholders’ deficit	$	8,940		$	10,023

Navistar International Corporation and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Six Months Ended April 30,
	2010			2009
(in millions)
Cash flows from operating activities
Net income	$	73		$	246
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization		132			140
Depreciation of equipment leased to others		26			27
Deferred taxes		11			(2	)
Amortization of debt issuance costs and discount		20			8
Stock-based compensation		16			11
Provision for doubtful accounts		34			28
Impairment of goodwill and intangibles		—			7
Equity in loss of non-consolidated affiliates, net of dividends		22			16
Other non-cash operating activities		34			44
Changes in other assets and liabilities, exclusive of the effects of businesses acquired and disposed		(102	)		(38	)
Net cash provided by operating activities		266			487
Cash flows from investing activities
Purchases of marketable securities		(663	)		(354	)
Sales or maturities of marketable securities		488			356
Net change in restricted cash and cash equivalents		201			(96	)
Capital expenditures		(78	)		(77	)
Purchase of equipment leased to others		(25	)		(18	)
Proceeds from sales of property and equipment		6			4
Investments in non-consolidated affiliates		(59	)		(14	)
Proceeds from sales of affiliates		3			3
Acquisition of intangibles		(11	)		—
Business acquisitions, net of cash received		(2	)		—
Net cash used in investing activities		(140	)		(196	)
Cash flows from financing activities
Proceeds from issuance of securitized debt		245			321
Principal payments on securitized debt		(536	)		(658	)
Proceeds from issuance of non-securitized debt		557			259
Principal payments on non-securitized debt		(728	)		(362	)
Net increase (decrease) in notes and debt outstanding under revolving credit facilities		(281	)		71
Principal payments under financing arrangements and capital lease obligations		(43	)		(24	)
Debt issuance costs		(22	)		(2	)
Proceeds from exercise of stock options		14			—
Dividends paid by subsidiaries to non-controlling interest		(33	)		—
Stock repurchases		—			(29	)
Net cash used in financing activities		(827	)		(424	)
Effect of exchange rate changes on cash and cash equivalents		(3	)		(10	)
Decrease in cash and cash equivalents		(704	)		(143	)
Cash and cash equivalents at beginning of period		1,212			861
Cash and cash equivalents at end of the period	$	508		$	718

Navistar International Corporation and Subsidiaries

Segment Reporting

(Unaudited)

We define segment profit (loss) as net income (loss) attributable to Navistar International Corporation excluding income taxes. Selected financial information is as follows:

	Truck			Engine			Parts			Financial Services(A)			Corporate and Eliminations			Total
(in millions)
Three Months Ended April 30, 2010
External sales and revenues, net	$	1,847		$	444		$	399		$	53		$	—		$	2,743
Intersegment sales and revenues		—			233			48			23			(304	)		—
Total sales and revenues, net	$	1,847		$	677		$	447		$	76		$	(304	)	$	2,743
Depreciation and amortization	$	(40	)	$	(27	)	$	(2	)	$	(7	)	$	(3	)	$	(79	)
Interest expense		—			—			—			29			35			64
Equity in (loss) income of non-consolidated affiliates		(11	)		(2	)		—			—			—			(13	)
Segment profit (loss)		76			15			58			16			(145	)		20
Capital expenditures(B)		24			11			2			—			2			39
Three Months Ended April 30, 2009
External sales and revenues, net	$	1,773		$	434		$	534		$	67		$	—		$	2,808
Intersegment sales and revenues		—			158			43			21			(222	)		—
Total sales and revenues, net	$	1,773		$	592		$	577		$	88		$	(222	)	$	2,808
Depreciation and amortization	$	45		$	32		$	1		$	6		$	4		$	88
Interest expense		—			—			—			38			19			57
Equity in (loss) income of non-consolidated affiliates		(10	)		22			2			—			—			14
Segment profit (loss)		56			(84	)		115			18			(84	)		21
Capital expenditures(B)		19			14			3			1			2			39
Six Months Ended April 30, 2010
External sales and revenues, net	$	3,563		$	1,069		$	816		$	104		$	—		$	5,552
Intersegment sales and revenues		1			429			98			47			(575	)		—
Total sales and revenues, net	$	3,564		$	1,498		$	914		$	151		$	(575	)	$	5,552
Depreciation and amortization	$	(80	)	$	(53	)	$	(3	)	$	(15	)	$	(7	)	$	(158	)
Interest expense		—			—			—			61			70			131
Equity in (loss) income of non-consolidated affiliates		(18	)		(2	)		1			—			—			(19	)
Segment profit (loss)		111			69			137			28			(300	)		45
Capital expenditures(B)		34			34			4			1			5			78
Six Months Ended April 30, 2009
External sales and revenues, net	$	3,834		$	783		$	1,019		$	142		$	—		$	5,778
Intersegment sales and revenues		1			318			98			39			(456	)		—
Total sales and revenues, net	$	3,835		$	1,101		$	1,117		$	181		$	(456	)	$	5,778
Depreciation and amortization	$	85		$	59		$	3		$	12		$	8		$	167
Interest expense		—			—			—			102			48			150
Equity in (loss) income of non-consolidated affiliates		(17	)		44			4			—			—			31
Segment profit (loss)		170			105			219			17			(263	)		248
Capital expenditures(B)		33			34			6			1			3			77
As of April 30, 2010
Segment assets	$	2,710		$	1,572		$	569		$	3,507		$	582		$	8,940
As of October 31, 2009
Segment assets		2,660			1,517			664			4,136			1,046			10,023

A. Total sales and revenues in the Financial Services segment include interest revenues of $65 million and $135 million for the three and six months ended April 30, 2010, respectively, and $76 million and $158 million for the same period in 2009.

B. Exclusive of purchase of equipment leased to others.

SEC Regulation G

The financial measures presented below are unaudited and non-GAAP. The measures are not in accordance with, or an alternative for, U.S. generally accepted accounting principles (GAAP). The non-GAAP financial information presented herein should be considered supplemental to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP. However, we believe that non-GAAP reporting, giving effect to the adjustments shown in the reconciliation below, provides meaningful information and therefore we use it to supplement our GAAP reporting by identifying items that may not be related to the core manufacturing business. Management often uses this information to assess and measure the performance of our operating segments. We have chosen to provide this supplemental information to investors, analysts and other interested parties to enable them to perform additional analyses of operating results, to illustrate the results of operations giving effect to the non-GAAP adjustments shown in the below reconciliations, and to provide an additional measure of performance.

	2010 Q2			2009 Q2			2010 Six Months			2009 Six Months
	As Reported With Impacts			As Reported With Impacts			As Reported With Impacts			As Reported With Impacts
Sales and revenues, net ($billions)	$	2.7		$	2.8		$	5.6		$	5.8
Manufacturing segment profit ($millions)*		149			87			317			494
Below the line items		(129	)		(66	)		(272	)		(246	)
Income (loss) excluding income tax		20			21			45			248
Income tax benefit (expense)		10			(9	)		2			(2	)
Net Income (loss) attributable to Navistar International Corporation	$	30		$	12		$	47		$	246
Diluted earnings (loss) per share ($s) attributable to Navistar International Corporation	$	0.42		$	0.16		$	0.65		$	3.44
Weighted average shares outstanding: diluted (millions)		72.8			71.3			72.4			71.5

* Includes: Net income attributable to non-controlling interest in net income of subsidiaries