CAR SPEC SHEET · 2026 GMC Sierra 2500HD/3500HD · from the owner's manual (2026 GMC Sierra 2500HD/3500HD Owner's Manual)
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2026 GMC Sierra 2500HD/3500HD specs

Maintenance specs from the 2026 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)

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Engine & fluids

Oil type 5W-30 All (normal temperatures)All (normal temperatures)0W-30 Extreme cold, below −29 °C …Extreme cold, below −29 °C (−20 °F)
Spark plugsgap · 6.6L V8 (L8T) 0.037–0.043 in

Tires & wheels

Lug nut torque 140 lb-ft

Other

Brake fluidall (gasoline engine) DOT 4 Hydraulic Brake Fluid
Power steering fluidall (gasoline engine) GM Power Steering Fluid
Differential fluidtransfer case · all (gasoline engine) 2.4 qt qt

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