2025 GMC Sierra 2500HD/3500HD specs
Maintenance specs from the 2025 GMC Sierra 2500HD/3500HD owner's manual. Open a spec for every version and the page it's printed on.
Engines covered: 6.6L V8 (L8T)
Engine & fluids
Tires & wheels
Lug nut torque
| Applies to | Value | Manual says | Page |
|---|---|---|---|
| All versions | 140 lb ft | “140 lb ft” | PDF page 408 ↗ |
Spark plugs
| Applies to | Value | Manual says | Page |
|---|---|---|---|
| 6.6L V8 (L8T) | 0.037–0.043 ingap | “0.95–1.10 mm (0.037–0.043 in)” | PDF page 408 ↗ |
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