To find the correct oil capacity for *your* Dodge Ram diesel, you need to:
1. Identify your engine: The engine code (e.g., Cummins 6.7L, or a specific model number) is crucial. This information is usually found on a sticker under the hood or in your owner's manual.
2. Check your owner's manual: This is the most reliable source for the exact oil capacity, including the amount added with a filter change.
Without knowing the specifics of your Dodge Ram diesel, I cannot provide the correct oil capacity.