The 2019 Ram 3500 with the 6.7L Cummins diesel uses a long‑life, ethylene glycol–based coolant that is approved for Cummins heavy‑duty engines. Use a 50/50 premixed solution (or concentrate mixed with distilled water) and follow any SCA (Supplemental Coolant Additive) dosing as recommended by the coolant manufacturer or Cummins guidance.
Choosing the right coolant matters for diesel engines like the 6.7L Cummins, which have aluminum components and multiple heat exchangers. The safest path is to use an OEM‑approved Extended Life Coolant (ELC) labeled for heavy‑duty diesel use and Cummins engines, and to adhere to the service intervals in your owner's manual. If in doubt, consult your dealer or Cummins Filtration for the exact specification applicable to your engine and build date.
What to use and why
Look for coolant that is explicitly labeled for heavy‑duty diesel engines and Cummins approval. It should be ethylene glycol–based, provide long‑life corrosion protection, and be suitable for mixed metals found in modern diesel cooling systems. Avoid automotive automotive‑only coolants that aren’t rated for Cummins/HD diesel use.
Key characteristics to look for
- Long‑life, ethylene glycol–based coolant formulated for heavy‑duty diesel engines
- Silicate‑free and phosphate‑free with corrosion inhibitors for aluminum, cast iron, and copper alloys
- Certified to meet Cummins heavy‑duty coolant specifications and compatible with SCA dosing if required by the product
- Available as premixed 50/50 or as concentrate to mix with distilled water
In practice, sticking to OEM‑approved coolant that explicitly states compatibility with Cummins engines helps prevent corrosion, deposits, and potential warranty concerns.
Mixture, additives and maintenance
Most 6.7 Cummins engines are filled with a 50/50 premixed coolant. If you purchase concentrate, mix it with distilled water to reach the 50/50 ratio, and never use hard water. Follow label directions for replacement intervals and SCA dosing if your coolant requires it.
SCA dosing and testing
Some extended‑life coolants require an SCA supplement to maintain corrosion protection over time. Use coolant test strips or a test kit to verify SCA levels and dose with an approved SCA product per the coolant manufacturer’s instructions. Re‑test after dosing and at scheduled service intervals to ensure the system remains protected.
Service intervals and best practices
Follow the service interval recommended in your owner's manual or by Cummins Filtration. Extended life coolants are typically rated for longer service life than conventional green antifreeze, but intervals still depend on climate, usage, and system condition. When in doubt, have the cooling system inspected during routine maintenance and consider a coolant flush if the vehicle has reached the end of its recommended life or if you notice abnormal temperatures, boil‑over, or corrosion signs.
Always confirm the exact specification with your manual or a Cummins‑trained technician, especially if the truck has had previous cooling system work or coolant changes, to ensure full compatibility and warranty compliance.
Summary
For a 2019 Ram 3500 with a 6.7L Cummins, use a long‑life, ethylene glycol–based coolant approved for heavy‑duty diesel engines and Cummins engines. Opt for a 50/50 premixed solution or concentrate mixed with distilled water, and follow SCA dosing if required. Choose coolant labeled for Cummins/HD diesel use, verify compatibility with your vehicle’s manual, and adhere to the recommended service interval to protect your cooling system and maintain warranty coverage.
What coolant does a Ram 3500 take?
Prestone – MAX Original Equipment Antifreeze + Coolant: Euro Blue, 50/50 Ready-to-Use, 1 Gallon (Part No. AF6110)
What color antifreeze does a 2019 Dodge Ram take?
orange
The original coolant color for a Dodge Ram 1500 Big Horn 3.6L is orange. This vehicle utilizes OAT (Organic Acid Technology) coolant, which is formulated for extended protection and complies with Chrysler Material Standard MS-12106. As long as you maintain the same base fluid, everything should be fine!
What kind of coolant does a 2019 Ram 3500 diesel take?
ZEREX – G-05 Formula 50/50 Pre-Mixed RTU Antifreeze / Coolant, 1 Gallon (Part No. ZXG05RU1) ZEREX G05® is the automaker approved original chemistry used in newer Ford®, Chrysler® and Mercedes-Benz® automotive and diesel engines.
What coolant goes in 6.7 Cummins?
PGXL® HD is a premium heavy-duty fully-formulated extended-life propylene glycol-based coolant.