2018 Ram ProMaster: Coolant Capacity & Type
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The 2018 Ram ProMaster with the 3.6L Pentastar V6 engine holds a total of 10.2 quarts (9.7 liters) of coolant.
Quick answer
- Total cooling system capacity: 10.2 qts (9.7 L)
- OEM coolant spec: Mopar OAT (Organic Acid Technology) MS-12106, purple in color
- Mix ratio: 50/50 mix of coolant concentrate and distilled water
Capacity by engine option
| Engine | Capacity (quarts) | Capacity (liters) |
|---|---|---|
| 3.6L Pentastar V6 | 10.2 | 9.7 |
Flush interval
- Normal duty: 10 years or 150,000 miles
- Severe duty: 5 years or 100,000 miles
How to refill & bleed
Refilling and bleeding the cooling system on the 2018 Ram ProMaster is a straightforward process.
- After draining the old coolant, close the radiator drain plug.
- Fill the coolant reservoir with a 50/50 mix of Mopar OAT MS-12106 coolant and distilled water until the level reaches the "MAX" line.
- Start the engine with the heater on its highest setting.
- As the engine warms up, the coolant level will drop. Continue to add coolant to the reservoir to maintain the "MAX" level.
- Once the engine reaches operating temperature and the coolant level stabilizes, replace the reservoir cap.
- It is recommended to use a spill-free funnel to make the process easier and prevent air from entering the system.
Common cooling system issues
While the 3.6L Pentastar V6 is a reliable engine, some common cooling system issues to watch for include:
- Radiator leaks: The plastic end tanks on the radiator can develop cracks over time, leading to coolant leaks.
- Water pump failure: The water pump may fail, causing the engine to overheat.
- Thermostat issues: A stuck thermostat can cause the engine to either overheat or fail to reach operating temperature.
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More specs for the 2018 Ram ProMaster
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Ram ProMaster Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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