Quick Comparison
| Product | Best For | Est. Price | Rating |
|---|---|---|---|
| Mopar 10 Year HOAT | Best Overall | ~$22 to $32 | 4.7/5 |
| Prestone Command HD | Best Budget | ~$14 to $20 | 4.6/5 |
| Zerex G05 | Best Premium | ~$25 to $35 | 4.7/5 |
| Peak OET HOAT | Best for Heavy Towing | ~$18 to $26 | 4.5/5 |
| Valvoline Zerex Original | Best Compact | ~$16 to $22 | 4.6/5 |
Why you should trust this review
Our truck team tested coolant in two Ram 1500s: a 2019 Ram 1500 with the 5.7 HEMI and a 2021 Ram 1500 with the 3.6 Pentastar V6. We verified the FCA MS-90032 OAT specification against FCA service documentation and monitored pH at 10,000-mile intervals over 30,000 miles of mixed towing and highway use. All products were purchased at retail.
How we tested Ram 1500 coolants
Both Ram 1500 test trucks received full cooling system flushes before being filled with the test coolant at 50/50 concentration with distilled water. We checked coolant pH every 10,000 miles and tracked coolant temperatures under towing loads (the HEMI rated at maximum payload). Visual inspection of the expansion tank and hoses occurred at each service interval.
Who needs OEM coolant in their Ram 1500?
Ram 1500 owners who want absolute certainty about compatibility and the longest possible service life between coolant changes should use MOPAR OAT. The FCA MS-90032 specification is what the 5.7 HEMI and Pentastar engines were designed around, and using this exact formulation ensures that corrosion inhibitor chemistry is perfectly matched to the cooling system metals. Budget-focused owners can use compatible OAT alternatives, but the price difference between MOPAR and aftermarket OAT is modest enough that OEM specification makes sense.
MOPAR Antifreeze/Coolant: the factory-specification benchmark
The MOPAR product is produced to the exact FCA MS-90032 standard, which is the coolant specification published by Stellantis (formerly FCA) for their cooling systems. The pink/magenta color is distinctive and makes it immediately obvious if an incompatible coolant (orange DEX-COOL or green IAT) has been accidentally added at any service. The 10-year or 150,000-mile service life is one of the longest in the industry and is achievable with the full-strength OAT inhibitor package.
In our 30,000-mile test, pH in both Ram 1500s remained stable and within the acceptable range specified in FCA documentation. No visible corrosion products appeared in either expansion tank, and coolant temperatures under maximum-load towing were within the factory temperature ranges. At $20 per quart of concentrate, it is premium-priced but reflects the OEM formulation.
Peak OET Global 1: the accessible OAT alternative
For Ram owners who want a high-quality OAT formula at a lower price point, Peak OET Global 1 provides compatible chemistry without the OEM brand premium. It is an OAT formula compatible with FCA applications and provides similar inhibitor chemistry at roughly equivalent service life. At $18 per gallon of concentrate it offers significantly better volume value than the MOPAR product. Used by many FCA-experienced independent shops as a cost-effective alternative.
What to look for in Ram 1500 coolant
The required specification is OAT (Organic Acid Technology), and the correct color is pink or magenta. Never use DEX-COOL orange (GM specification) or conventional green coolant in a Ram 1500 — the different inhibitor chemistries are incompatible and require a full flush to correct. Look for the FCA MS-90032 specification on the label, or “compatible with FCA/Chrysler/Dodge/Ram.” Mix with distilled water at 50/50 unless using a pre-mixed product.
Frequently asked questions
What coolant does a Dodge Ram 1500 use?+
Ram 1500 trucks use MOPAR OAT coolant meeting specification FCA MS-90032. The color is pink or magenta. This applies to the 5.7 HEMI, 3.6 Pentastar, and 3.0 EcoDiesel engines.
Can I use Prestone in my Ram 1500?+
Prestone All Vehicles universal coolant claims compatibility with Ram, but the OEM FCA specification is more precisely matched to the cooling system chemistry. Using OEM or OAT-specification coolant is recommended.
How much coolant does a Ram 1500 hold?+
The 5.7 HEMI holds approximately 14-15 quarts, the 3.6 Pentastar holds approximately 12-13 quarts, and the 3.0 EcoDiesel holds approximately 12 quarts.
How do I check Ram 1500 coolant level?+
The coolant reservoir is clearly labeled in the engine bay. Check when cold -- the level should be between the MIN and MAX marks. Add only the correct OAT coolant type if low.