2015 Ram 1500 Coolant Capacity and Type

A 2015 Ram 1500 holds between 14 and 18.1 quarts (13.2 - 17.1 L) of coolant, depending on the engine option.

Quick answer

• Total Cooling System Capacity: 14 - 18.1 quarts (13.2 - 17.1 L)
• OEM Coolant Specification: Mopar OAT (Organic Acid Technology) meeting Chrysler specification MS-12106. This coolant is typically purple.
• Mix Ratio: 50/50 mix of coolant concentrate and distilled water. Using a pre-mixed 50/50 solution is highly recommended.

Capacity by Engine Option

The exact capacity depends on the engine and equipment in your truck:

Flush Interval

The original Mopar OAT coolant in a 2015 Ram 1500 has a very long service life.

• Normal Duty: 10 years or 150,000 miles (240,000 km), whichever comes first.
• Severe Duty: Inspect regularly, but the 10-year/150,000-mile interval is generally sufficient. Severe duty includes frequent towing, heavy loads, or extensive idling.

Important: Do not mix coolant types. If you are unsure what coolant is in the system, it is best to perform a complete flush and refill with the specified OAT MS-12106 coolant.

How to Refill & Bleed

Properly bleeding the air from the cooling system is critical on these trucks to prevent overheating.

1. Refill Slowly: After draining the old coolant, slowly add the 50/50 mix to the coolant reservoir (degas bottle) until it is at the 'MAX' line.
2. Bleed the System: The 5.7L HEMI V8 and 3.6L V6 both have bleeder screws to help remove trapped air. The 5.7L bleeder is typically located on the thermostat housing, while the 3.6L bleeder is on the oil cooler housing. Open the bleeder screw while filling until a steady stream of coolant flows out, then close it.
3. Run the Engine: Start the engine with the heater on high and the reservoir cap loose (or off). Let the engine run until it reaches operating temperature and the thermostat opens. You will see the coolant level drop.
4. Top Off: Add more coolant to the reservoir to bring the level back to the 'MAX' line as air burps out. Squeezing the upper radiator hose can help expel stubborn air pockets.
5. Vacuum-Fill Recommended: To guarantee no air is trapped, using a vacuum-fill tool is the professional method and is highly recommended for these vehicles.

Common Cooling System Issues

The 2015 Ram 1500 is generally reliable, but some common cooling system issues for this generation include:

• Water Pump Failure: A weep from the water pump bearing or a more significant leak can occur over time. Watch for drips from the front of the engine.
• Thermostat Housing Leaks: The plastic thermostat housings, especially on the 3.6L V6, can crack or develop leaks at the seals over time.
• Radiator Leaks: The radiators can develop leaks at the seams where the plastic end tanks are crimped to the aluminum core. A visual inspection will often reveal white or colored crusty residue where coolant has dried.

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