2018 Jeep Wrangler Coolant Capacity & Type

The 2018 Jeep Wrangler (JL and JK models) holds approximately 9.9 to 13.9 quarts (9.4 to 13.2 liters) of coolant, depending on the engine and transmission configuration.

Quick Answer

• Total Cooling System Capacity: 9.9 - 13.9 quarts (9.4 - 13.2 liters)
• OEM Coolant Spec: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology) - Purple in color (Mopar P/N 68163848AB or equivalent meeting Chrysler Material Standard MS-90032).
• Mix Ratio: 50/50 prediluted, or 50/50 mix of concentrate with distilled water.

Capacity by Engine Option

(Capacities are approximate and may vary slightly based on specific vehicle configuration and options.)

Flush Interval

Jeep recommends specific service intervals for coolant replacement to ensure optimal cooling system performance and longevity of components.

• Normal Duty: Replace every 10 years or 150,000 miles, whichever comes first.
• Severe Duty (e.g., frequent towing, off-roading, extreme temperatures): Consider inspecting more frequently and potentially replacing sooner, though the published interval remains the same for the OAT coolant.

Regularly check your coolant level and condition between services. If the coolant appears discolored or contaminated, it should be flushed and replaced sooner.

How to Refill & Bleed

Properly refilling and bleeding the cooling system is crucial to prevent air pockets, which can cause overheating. For the 2018 Jeep Wrangler, follow these general steps:

1. Preparation: Ensure the engine is cool. Place a drain pan under the radiator. Never open the radiator cap when the engine is hot.
2. Drain: Open the radiator drain cock (petcock) located at the bottom of the radiator. Some models may have an additional drain on the engine block. Allow all old coolant to drain completely.
3. Flush (Optional but Recommended): Close the drain cock and refill with distilled water. Run the engine with the heater on high until it reaches operating temperature. Drain again. Repeat until the drained water is clear. (Do not use chemical flush products unless specifically recommended by Jeep, as they can sometimes damage cooling system components).
4. Refill: Close the drain cock. Slowly fill the coolant reservoir to the "MAX" or "FULL COLD" line with the specified Mopar OAT coolant (50/50 pre-diluted or mix concentrate with distilled water). Overfilling can result in coolant being expelled from the overflow.
5. Bleed Air (3.6L Pentastar & 2.0L Turbo): The 2018 Wrangler generally uses a self-bleeding system, but it