2015 Ram 3500 coolant capacity
The 2015 Ram 3500 holds about 16.6 to 22.6 quarts of coolant, depending on the engine - the full cooling-system capacity when cold.
Key takeaways
- The 2015 Ram 3500 holds about 16.6 to 22.6 quarts of coolant total, depending on engine.
- This is the full cooling-system fill with the engine cold.
- Refill to the marked level, and use the coolant type your owner's manual specifies.
| Engine | Capacity | Liters |
|---|---|---|
| 5.7L 8-cyl (EZC) | 18.3 qt | 17.3 L |
| 6.4L 8-cyl (ESA) | 16.6 qt | 15.7 L |
| 6.4L 8-cyl (ESB) | 16.6 qt | 15.7 L |
| 6.7L 6-cyl turbo diesel (ETK) | 22.6 qt | 21.4 L |
What a coolant change costs
At roughly 4.2 to 5.7 gallons of capacity, the coolant itself is about $63 to $171. 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 2015 Ram 3500
Buy the coolant type your owner's manual specifies and check it on the jug - the wrong type can gel or corrode the system. Amazon's results are filtered to this vehicle, but the type is on you to match. To compare prices and reviews:
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.