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What type of oil does a 2005 dodge diesel use?

A 2005 Dodge diesel truck (assuming you mean a Ram, as Dodge trucks are now Ram trucks) likely uses CJ-4 or possibly CH-4 diesel engine oil, depending on the specific engine.

However, you absolutely MUST check your owner's manual. The manual will specify the exact type and viscosity of oil recommended for your particular engine. Using the wrong oil can severely damage your engine. The oil type and viscosity are also often indicated on a sticker under the hood.