6.6L V8 Duramax Diesel4WDAUTOMATICdieselturbo
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Fluid · Coolant

Coolant

for 2009 GMC Sierra 2500HD 6.6L V8 Duramax Diesel · 4WD
Fluid Type
Dex-Cool 50/50
Spec: GM 6277M
Capacity
28qt
26.49 L
Drain & Refill
23 qt
21.76 L
Change Interval
150,000 mi
241,350 km

Notes

Extended life orange coolant. Larger capacity due to diesel engine cooling requirements.

Buy on Amazon
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other fluid systems on this vehicle

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
⚠ STILL BEHIND THE PAYWALL
The 2009 GMC Sierra 2500HD repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the GMC Sierra 2500HD — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →