2010 GMC Sierra 2500HD coolant capacity
The 2010 GMC Sierra 2500HD holds about 16.4 to 21.6 quarts of coolant, depending on the engine - the full cooling-system capacity when cold. The factory coolant is GM DEX-COOL (orange).
Key takeaways
- The 2010 GMC Sierra 2500HD holds about 16.4 to 21.6 quarts of coolant total, depending on engine.
- This is the full cooling-system fill with the engine cold.
- Coolant: GM DEX-COOL (orange). Refill to the marked level and don't mix coolant types.
| Engine | Capacity | Liters |
|---|---|---|
| 6.0L 8-cyl (L96) | 16.4 qt | 15.5 L |
| 6.0L 8-cyl | 16.4 qt | 15.5 L |
| 6.6L 8-cyl turbo diesel (LMM) | 21.6 qt | 20.4 L |
Which coolant the 2010 GMC Sierra 2500HD takes
The factory coolant is GM DEX-COOL (orange). Mixing coolant types can cause sludge and corrosion, so top up with the same product, or drain and refill completely when you switch. Other brands are fine if the jug says they meet GM 6277M.
Source: Penray, DEX-COOL frequently asked questions (archived copy), PEAK OET Antifreeze+Coolant Application Chart (Old World Industries). Confirm against your owner's manual or the label on the coolant reservoir.
What a coolant change costs
At roughly 4.1 to 5.4 gallons of capacity, the coolant itself is about $61 to $162. A shop charges $70 to $120 for a drain and fill, or $100 to $250 for a full flush. Use the specification the manufacturer lists - mixing coolant chemistries is what turns a cheap service into a water-pump job.
Ranges aggregated from published 2026 US repair-cost and parts price guides, including RepairPal and Car Talk. Prices vary by region, brand, and vehicle - treat these as a sanity check on a quote, not a fixed price. Drain and fill vs flush →
Coolant for your 2010 GMC Sierra 2500HD
Buy GM DEX-COOL (orange), or a coolant that says on the jug it meets the same spec (GM 6277M). Check whether it is premixed 50/50 or concentrate before you pour. To compare prices and reviews:
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