Installation Time
(approx) 30 Minutes
Difficulty Level:
Simple installation for anyone.
FREE 1 to 3-Day Delivery on Orders $149+ Details
Mishimoto Aluminum Coolant Expansion Tank; Black (18-26 Jeep Wrangler JL, Excluding Rubicon 392)
Find parts that fit my vehicle Item J258515
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Mishimoto Aluminum Coolant Expansion Tank
- TIG-Welded Aluminum Construction for Maximum Strength
- Internal Baffling to Reduce Aeration and Fluid Slosh
- Increased Coolant Capacity Compared to Stock
- Easy-to-Read Sight Glass for Quick Fluid Checks
- Eliminates Cracking and Seam Leaks Common in Factory Plastic Tanks
- Simple DIY Installation Design
- Includes High-Pressure Radiator Cap
- Black Powder-coated Finish
- Mishimoto Lifetime Warranty
- Fits 2018 to 2026 Jeep Wrangler JL, Excluding Rubicon 392
| Brand | Mishimoto |
| Reservoir Tank Type | Coolant |
Description
High-Strength Cooling System Upgrade. The Mishimoto Aluminum Coolant Expansion Tank is a premium replacement for your Wrangler JL's stock plastic reservoir, designed to improve durability, performance, and under-hood style. With increased coolant capacity and internal baffling, this tank reduces fluid slosh and aeration, helping maintain consistent coolant pressure under demanding conditions. It's a functional upgrade that enhances both performance and reliability for daily driving and off-road use.
Construction and Appearance. Crafted from TIG-welded aluminum, this expansion tank offers unmatched strength and longevity compared to OEM plastic tanks prone to cracking and seam leaks. It features a black powder-coated finish for corrosion resistance and a stealthy appearance, while the integrated sight glass allows for fast and easy coolant level checks. The included high-pressure radiator cap further enhances system efficiency and temperature control.
Installation. Installation is simple and designed for DIY enthusiasts. The tank bolts directly into place using factory mounting points, with no cutting or modifications required.
Warranty. This product is backed by the Mishimoto lifetime warranty, offering peace of mind and long-term support.
Application. This Mishimoto Aluminum Coolant Expansion Tank fits 2018 to 2026 Jeep Wrangler JL, excluding Rubicon 392.
Mishimoto MMRT-JL-18
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Install Details & What's in the Box
Installation Info
What's in the Box
- (1) Aluminum Coolant Expansion Tank
- (1) High-Pressure Radiator Cap
- (1) Installation Hardware Kit
4.9
Customer Reviews (17)
Questions & Answers
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Will It Fit My Wrangler
- JL Rubicon 2 Door - 18, 19, 20, 21, 22, 23, 24, 25, 26
- JL Rubicon 4 Door - 18, 19, 20, 21, 22, 23, 24, 25, 26
- JL Rubicon 4xe 4 Door - 21, 22, 23, 24, 25
- JL Wrangler 2 Door - 18, 19, 20, 21, 22, 23, 24, 25, 26
- JL Wrangler 4 Door - 18, 19, 20, 21, 22, 23, 24, 25, 26
- JL Wrangler 4xe 4 Door - 21, 22, 23, 24, 25
