GM 6.6L Duramax V8 Turbo Diesel Oil Capacity
The 2026 GM 6.6L Duramax V8 Turbo Diesel takes 10 quarts (9.5 L) of SAE 15W-40 with a filter change. Every year range below is read from the Chevrolet/GMC owner's manual for those years.
Source: manufacturer documents (listed below) · Updated 2026-11-05 · By CarWhere Research
| Years | Application | Capacity (qt) | Capacity (L) | Oil type | Spec | Notes |
|---|---|---|---|---|---|---|
| 2026 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[1] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | |
| 2025 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[2] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | |
| 2024 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[3] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
| 2023 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[4] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
| 2022 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[5] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | |
| 2021 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[6] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | |
| 2020 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[7] | 9.5 L | SAE 15W-40 | API CJ-4 or CK-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
| 2019 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[8] | 9.5 L | SAE 15W-40 | API CJ-4 | |
| 2018 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[9] | 9.5 L | SAE 15W-40 | API CJ-4 | |
| 2017 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[10] | 9.5 L | SAE 15W-40 | API CJ-4 | |
| 2016 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[11] | 9.5 L | SAE 15W-40 | API CJ-4 | |
| 2015 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[12] | 9.5 L | SAE 15W-40 | API CJ-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
| 2014 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[13] | 9.5 L | SAE 15W-40 | API CJ-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
| 2013 | Silverado/Sierra 2500HD/3500HD (6.6L Duramax) | 10 qt[14] | 9.5 L | SAE 15W-40 | API CJ-4 | SAE 5W-40 advised below 0°F (-18°C) for easier cold starts. |
Capacities are with filter change unless noted. Always confirm on the dipstick after refilling.
Other engines
Check the exact vehicle, not just the model
Trim, package and production changes all move these numbers. Decode the 17-character VIN with the free VIN decoder to confirm the engine and trim, or see the federal engine and MPG specs. Shopping? Browse live inventory and what buyers actually paid.
Frequently asked questions
How much oil does the GM 6.6L Duramax V8 Turbo Diesel take?
For 2026 Silverado/Sierra 2500HD/3500HD (6.6L Duramax), the owner's manual lists 10 quarts (9.5 L) with a filter change. Other years are in the table above.
What oil does the GM 6.6L Duramax V8 Turbo Diesel use?
The manufacturer specifies SAE 15W-40 depending on year, meeting the spec listed in the table. Climate-specific alternatives, where the manual allows them, are in the notes.
Sources
- General Motors, 2026 6.6L Duramax Diesel Engine Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 65); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2025 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 66); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2024 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 64); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2023 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 67); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2022 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 72); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2021 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 69); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2020 Chevrolet and GMC Duramax Diesel 6.6L Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 90); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2019 Chevrolet and GMC Duramax Diesel Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 130); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2018 Chevrolet and GMC Duramax Diesel Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 133); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2017 Chevrolet and GMC Duramax Diesel Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 136); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2016 Chevrolet and GMC Duramax Diesel Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 128); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2015 Chevrolet / GMC Duramax Diesel Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 117); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2014 Chevrolet and GMC Duramax Diesel Owner Manual Supplement, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 129); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).
- General Motors, 2013 Chevrolet and GMC DURAMAX Diesel Owner Manual, Technical Data - Capacities and Specifications, 'Engine Oil with Filter' (PDF p. 127); Vehicle Care - Engine Oil (specification/viscosity) (accessed 2026-11-05).