The Ram 1500 typically relies on Mopar long-life antifreeze/coolant designed for FCA engines, usually a premixed 50/50 HOAT-type coolant. Always verify the exact specification for your year and engine in the owner's manual or on the under-hood label.
Understanding Ram 1500 coolant types
Automakers use different long-life coolant chemistries over the life of a model. FCA/Chrysler has primarily relied on HOAT (Hybrid Organic Acid Technology) formulations in many Ram 1500s, with some years also using OAT (Organic Acid Technology) variants. The critical rule is to use exactly the coolant type specified for your vehicle and never mix different chemistries.
HOAT vs OAT: what matters
HOAT blends organic acids with conventional inhibitors (often including silicates) to protect aluminum cooling systems, while OAT relies mainly on organic acids with different protective profiles. Your Ram’s manual or under-hood label will indicate which type is required and the correct mix ratio.
Common coolant families used in Ram 1500s
There are two broad families FCA has used in Ram 1500s. Before you buy or top off, know which one your truck expects:
- HOAT-based long-life coolant (often sold as Mopar Antifreeze/Coolant for FCA vehicles). This is the most common choice for Ram trucks in recent years and is typically premixed 50/50 for ease of use.
- OAT-based long-life coolant (used in some models/years). OAT formulations are designed for longer service intervals but require careful compatibility checks with the vehicle’s system.
Conclusion: In practice, most Ram 1500s use Mopar long-life HOAT coolant, but some configurations may use OAT. Always verify with the manual or label before purchasing.
Current-generation Ram 1500 (2019–present)
For these models, FCA commonly specifies Mopar long-life HOAT coolant, premixed and designed for aluminum cooling systems. If your vehicle is equipped with a newer engine option, the exact spec may still align with Mopar’s long-life coolant family—always confirm with the owner’s manual or dealership.
Earlier Ram 1500 (2009–2018)
These trucks generally follow the same principle: use the Mopar long-life coolant specified for the era and engine. However, there are variations by engine (gasoline vs. diesel) and production run, so checking the manual or the under-hood label is necessary to ensure you’re using the correct product.
How to verify the exact coolant for your Ram 1500
To ensure you buy the right coolant, follow these steps:
- Check the owner’s manual for the exact coolant specification (brand, type, and mix ratio) for your engine and year.
- Inspect the under-hood label near the radiator cap or coolant reservoir for the recommended coolant type and mix. FCA vehicles often list Mopar Antifreeze/Coolant as the required product.
- Match the coolant to the correct mix ratio (commonly 50/50). Deviating from the recommended concentration can impact cooling performance and freeze/boil protection.
- If you’re unsure, contact a dealer or a qualified mechanic for Mopar-approved coolant that matches your exact Ram configuration.
Conclusion: When in doubt, rely on the official vehicle specification. Using non-approved coolants or mixing incompatible chemistries can cause cooling-system damage or warranty issues.
Summary
Most modern Ram 1500s require Mopar long-life coolant, typically HOAT and premixed 50/50. The exact specification depends on year and engine, so always verify with the owner's manual or the under-hood label. Use only the recommended coolant, avoid mixing different chemistries, and consult a dealer if you’re unsure.