2025 6.6l Duramax Oil Capacity. Here is some helpful specs from a different forum article that will cover gas trucks as well as the 6.6, its all useful information. Send in oil samples every 300 hours and when they said they are seeing the additive pacakge starting to break down, be prepared to change oil next down time.
The l5p duramax diesel can be. Always consult the ownerโs manual of your vehicle for the exact capacity of oil.