fact_checkYear answer

2006 5.9 Cummins Oil Capacity

The 2006 5.9 Cummins oil capacity is 12 qt with filter, depending on the vehicle application. The primary listed application uses 12 qt (11.4 L) with a new filter.

With filter

12 qt

Oil spec

API CI-4 / CJ-4 diesel oil as applicable

Common viscosity

15W-40 normal service; 5W-40 synthetic for cold service

Oil Capacity by Year and Application

All numbers below are with a new oil filter.

2003-2007Dodge Ram 2500 / 3500 with 5.9L Cummins common-rail12 qt11.4 LAPI CI-4 / CJ-4 diesel oil as applicable
Use this as the fast lookup answer for 2006, then confirm the exact truck series and owner manual before filling. The with-filter capacity is the right number for a full oil and filter change.
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