January 6, 2009 Oshkosh, WI — Oshkosh Corporation (NYSE:OSK) and Detroit Diesel Corporation, a subsidiary of Daimler Trucks North America, LLC, have developed a strategic relationship to supply engines to the Oshkosh Corporation Fire & Emergency businesses. Detroit Diesel, a leading engine manufacturer, will provide the 2010 EPA emissions standards compliant Detroit DD13 diesel engine to Pierce Manufacturing, North America’s largest manufacturer of fire and rescue apparatus. The DD13 is an advanced design that offers seamless integration of Detroit Diesel’s BlueTec® selective catalytic reduction (SCR) technology that according to the company’s test data does not compromise power, fuel economy or performance.

Detroit Diesel is working with Daimler Trucks N. A. that has been building and operating more than 100,000 SCR heavy-duty diesel trucks in Europe and around the world.

“Working with Oshkosh Corporation and Pierce Manufacturing to develop the Detroit Diesel engines as the best performance solution for its customers to meet the upcoming 2010 EPA heavy-duty on-highway emissions standards, is a significant opportunity for Detroit Diesel, our subsidiary,” said Mark Lampert, senior vice president of sales for Daimler Trucks North America.

The Detroit diesel engine, DD13 is a smart, fuel efficient designed engine that has demonstrated up to five percent better fuel economy, while delivering improved serviceability, power and torque on demand.

“We want to provide fire departments the option of achieving the most stringent emissions targets while maximizing engine performance and reducing fuel consumption,”
said Wilson Jones, Oshkosh Corporation executive vice president and Fire & Emergency president. “The strategic relationship with Detroit Diesel allows our customers the choice of advanced emissions control technology and the proven performance and reliability of Detroit Diesel engines.”

SCR is a proven emissions-reduction technology with the ability to deliver near-zero emissions of nitrogen oxides (NOx), a smog-causing pollutant and greenhouse gas. The technology works by injecting diesel exhaust fluid (DEF), a simple solution of water and urea, into the exhaust. DEF works with the heat of the exhaust and a catalyst to convert NOx into nitrogen and water vapor – two harmless and natural components of air. Utilizing SCR to reduce emissions allows the engine to produce efficient power and torque.

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·          BlueTec® is a registered trademark of Detroit Diesel Corporation

Oshkosh Corporation Fire & Emergency Group

Known for safety, quality and leading-edge technology, the Oshkosh Corporation Fire and Emergency Group designs and manufactures a full line of fire apparatus, mobile medical, broadcast communications, recovery and homeland security vehicles. Brands under the F&E Group include Oshkosh^®,  Pierce^®, Medtec^®, Jerr-Dan^®, BAI^®, Oshkosh Specialty Vehicles, Frontline^™ and SMIT^™.  To learn more about Pierce vehicles, visit www.piercemfg.com  

About Oshkosh Corporation
Oshkosh Corporation is a leading designer, manufacturer and marketer of a broad range of specialty access equipment, commercial, fire & emergency and military vehicles and vehicle bodies. Oshkosh Corporation manufactures, distributes and services products under the brands of Oshkosh^®, JLG^®, Pierce^®, McNeilus^®, Medtec^®, Jerr-Dan^®, BAI^™, Oshkosh Specialty Vehicles, Frontline^™, SMIT^™, Geesink^™, Norba^™, Kiggen^™, CON-E-CO^®, London^® and IMT^®. The Oshkosh brands are valued worldwide in businesses where high quality, superior performance, rugged reliability and long-term value are paramount.  For more information, log on to www.oshkoshcorporation.com.

Forward-looking Statements

This press release contains statements that the Company believes are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact, including statements regarding the Company's future financial position, business strategy, targets, projected sales, costs, earnings, capital spending and debt levels, and plans and objectives of management for future operations, are forward-looking statements. When used in this press release, words such as “may,” “should,” "expects," "intends," "estimates," "anticipates," or "believes" and similar expressions are generally intended to identify forward-looking statements. These forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties, assumptions and other factors, some of which are beyond the Company's control which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These factors include the consequences of the Company's financial leverage position, especially given recent turmoil in the credit markets, and the level of associated borrowing costs; the Company’s ability to maintain compliance with financial covenants in its credit agreement; the cyclical nature of the Company's access equipment, commercial and fire & emergency markets, especially during a global economic downturn and credit crisis; the Company’s ability to offset higher steel and raw material costs through other cost decreases or product selling price increases; risks related to reductions in government expenditures and the uncertainty of government contracts; risks associated with international operations and sales, including foreign currency fluctuations; and the Company's ability to turn around its Geesink Norba Group business. Additional information concerning these and other factors is contained in the Company's filings with the Securities and Exchange Commission.

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