1. Diesel Engine Emissions Summit June 10, 2003 Phoenix, Arizona Rainer E. Schmueckle President and CEO Freightliner LLC

2. Two Decades of Emissions Regulations NOx (g/bhp-hr) PM (g/bhp-hr) 0.2 1991 1994 1998 2002/2004 1990 0.1 0.2 0.3 0.4 0.5 0.6 0.01 1.02.03.04.05.06.0 20072010

3. Current Emissions Strategies Control In-Cylinder Combustion 1.Retarded Injection Timing 2.Boost Injection Pressure 3.Reduce Peak Combustion Temperature (e.g., EGR, ACERT) Collectively, These Strategies Reduce Vehicle Fuel Economy! –Less Than Optimal Combustion © Freightliner LLC. All Rights Reserved. 6/10/03

4. Diesel Engine Emissions Summit June 10, 2003 Phoenix, Arizona

5. Emissions Reduction Strategies NOx PM 0.2 0.01 Particulate Filter SCR / NOx Adsorber Combustion Controls Optimized Combustion © Freightliner LLC. All Rights Reserved. 6/10/03

6. Diesel Engine Emissions Summit June 10, 2003 Phoenix, Arizona

7. Exhaust Gas Recirculation Engine Large Particulate Filter In 2007, High Rates of EGR (or ACERT) May be Used - Known Technology - Decreases Fuel Economy - Increases Engine Heat Rejection - Weight Issues © Freightliner LLC. All Rights Reserved. 6/10/03

8. Selective Catalytic Reduction Engine Smaller Particulate Filter SCR Urea Injection In 2007, SCR systems May be Used - Optimize In-cylinder Combustion - Increase in Fuel Economy - Possible Weight, Maintenance Benefits - Urea Infrastructure – the Challenge Smaller Particulate Filter Urea Injection SCR © Freightliner LLC. All Rights Reserved. 6/10/03

9. Engine Particulate Filter NOx Adsorber Diesel Injection Diesel Injection NOx Adsorber NOx Adsorber NOx Adsorbers are not Currently Viable - Too Large - Too Expensive - Diesel Must be Injected in Exhaust (Fuel Economy Penalty) © Freightliner LLC. All Rights Reserved. 6/10/03

10. Emission Technology Comparison Current Research High EGRSCRNOx Adsorber Fuel Economy-3%+6% (3 - 6% Urea Usage) -3% Cooling Requirements+55%-20%0% Power Density-5%+6%0% Weight+50 lbs.-400 lbs.+200 lbs. Oil Exchange Intervals1X2X1X Urea InfrastructureNoYesNo Drivers ResponsibilityNoneUrea RefillNone © Freightliner LLC. All Rights Reserved. 6/10/03 Preliminary Estimates As of June 2003

11. Diesel Engine Emissions Summit June 10, 2003 Phoenix, Arizona