Most 2018 Jeep models use Mopar long-life antifreeze/coolant, premixed in a 50/50 blend and based on an ethylene glycol formulation designed for FCA vehicles. Always verify the exact specification for your exact model and engine in the owner’s manual or with a Jeep dealer.
Understanding the coolant specification for 2018 Jeeps
In 2018, FCA US LLC recommended using Mopar Extended Life Coolant (ELC) for Jeep models. The coolant is typically sold as a premixed 50/50 solution and is formulated to meet FCA specifications for all-year operation. This approach is intended to protect cooling system components, prevent corrosion, and maintain proper engine temperature across a wide range of driving conditions. While most 2018 Jeep SUVs share a common cooling-system requirement, the exact specification can vary by engine or trim, so it’s wise to confirm via the owner’s manual or a dealership if you’re unsure.
What to look for on the coolant label
Before inspecting or purchasing coolant, check for a label that confirms compatibility with FCA vehicles and the 50/50 premixed formulation. The official Mopar label will typically indicate Mopar Antifreeze/Coolant, Extended Life, premixed 50/50, and may reference the FCA MS 9769 specification. Using OEM-approved coolant helps ensure warranty coverage and optimal protection for the cooling system.
- Look for Mopar Extended Life Coolant or a direct Mopar Antifreeze/Coolant label.
- Ensure the product is premixed in a 50/50 ratio (coolant and distilled water).
- Confirm it meets FCA US LLC specifications (often listed as MS 9769 or similar FCA references).
- Avoid mixing with non-OEM brands unless the manual explicitly allows it and compatibility is confirmed.
- If in doubt, consult a Jeep dealer or qualified technician for guidance on the correct coolant for your engine.
Concluding: Using the correct Mopar extended-life coolant ensures compatibility with the Jeep’s materials and corrosion protection system, supports reliable overheating protection, and preserves warranty coverage.
How to handle coolant top-ups or replacement on a 2018 Jeep
Below are the typical steps to top up or replace the coolant using the recommended OEM product. Always work with the engine cool and follow safety precautions when handling antifreeze.
- Ensure the engine is completely cool before opening the cooling-system reservoir or radiator cap.
- Locate the correct coolant—preferably Mopar Extended Life Coolant in premixed 50/50 form.
- Check the current coolant level in the reservoir. If topping up, use only the same premixed coolant type and do not mix with other brands or concentrations.
- Pour slowly to reach the recommended level marked on the reservoir (typically between “MIN” and “MAX”).
- When performing a drain-and-fill, you may need to drain cooling-system fluid and refil with fresh premixed coolant, then bleed the system according to the service manual instructions.
- Run the engine with the heater on high until the thermostat opens and the coolant circulates fully. Then recheck for proper level and look for leaks.
- Dispose of old coolant according to local environmental regulations and never pour it down a drain or onto the ground.
Concluding: Following the OEM-recommended coolant type and the proper refill procedure helps ensure optimal cooling performance and avoids potential damage from improper mixtures or air pockets in the system.
Model-specific considerations for the 2018 Jeep lineup
Wrangler, Grand Cherokee, Cherokee, Compass, Renegade
These 2018 Jeep models commonly use the Mopar Extended Life Coolant in a 50/50 premixed formulation that complies with FCA specifications. Engine options vary (gasoline and diesel across different trims), but the coolant requirements are generally aligned. If you own a diesel variant (for example, EcoDiesel options present in certain trims), verify whether the same coolant specification applies, as some diesel applications may have particular requirements within the broader Mopar ELC family. Always confirm with the owner’s manual or a Jeep service advisor for your exact engine and configuration.
Bottom line: For 2018 Jeep vehicles, the standard guidance is to use Mopar Extended Life Coolant (premixed 50/50, ethylene glycol-based) that meets FCA specifications. Keep to OEM-recommended coolant and follow proper bleeding and refill procedures to maintain cooling-system integrity and warranty validity.
Quick practical recap
What you should use: Mopar Extended Life Coolant (ELC), premixed 50/50, designed for FCA vehicles. Where to verify: owner’s manual, reservoir labels, or a Jeep dealership. What to do if unsure: do not mix with non-OEM coolants and consult a dealer or qualified mechanic for the correct specification for your exact 2018 Jeep model and engine.
Summary: The 2018 Jeep line generally uses Mopar Extended Life Coolant in a premixed 50/50 solution, formulated for FCA vehicles. Always verify the exact specification for your model, use OEM-approved coolant, and follow proper bleeding and refill procedures to ensure cooling-system reliability.