Executive order
D-249-5
Donaldson Company
Vehicle applications
No vehicle applications were preserved for this order.
Part records
| Part number | Model/specification | Modification | Remarks |
|---|---|---|---|
| DPM111144 | 2003 MY Caterpillar 3126 and 2004 MY Caterpillar C7 heavy-duty diesel engines, originally equipped with diesel oxidation catalysts | The stock diesel oxidation catalysts are replaced with the DPF Mufflers. The exemption is limited to 280 school buses owned by First Student, Inc. and operated in the Los Angeles Unified School District. The exemption is only valid provided that the engines meet the following operating conditions: (1) engine exhaust temperature is greater than or equal to 225 degrees Celsius for 40-50 percent of the duty cycle and (2) the engine is fueled with diesel having a maximum sulfur content of 50 ppmw. |