1. 5.9L Cummins Turbo Diesel: Approximately 11 quarts (10.4 liters) with an oil filter change.
2. 5.9L High-Output Cummins Turbo Diesel: Approximately 12 quarts (11.3 liters) with an oil filter change.
Please note that these capacities are approximate and may slightly vary, so it's always best to consult your vehicle's owner's manual or a reliable source of information for specific oil capacity details for your 2003 Dodge diesel. Additionally, it's recommended to use the recommended type and grade of oil specified by the manufacturer for optimal performance and longevity of your engine.