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Mishimoto Aluminum Coolant Expansion Tank; Black (15-23 Mustang)

Item 389662
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Market Price $226.99 You Save 10% ($22.04)
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$204.95 (each)

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      Video Review & Installation

      Hey guys. Stephanie with, here with a Mishimoto Aluminum Coolant Expansion Tank for 2015 and up Mustangs. The Mishimoto Aluminum Coolant Expansion Tank is perfect for those S550 owners out there that are looking for some underhood improvements. The factory coolant expansion tank is plastic, and it looks like a bubble which can leave a lot to be desired in the looks department, especially over time.The Mishimoto tank is not only more attractive, making for a better appearance, but it's also more durable and stronger than the factory plastic tank as well. Just looking at the Mishimoto tank here you can see that it's an obvious appearance upgrade right away. It has an attractive one-piece design instead of the stock two-piece design, and it's made from aluminum, and it has lovely welds on it. Even though this tank is powder coated black, the welds are obvious, and Mishimoto doesn't look like they were rushing when they were building this tank. If you weren't that into the black, Mishimoto does offer the same tank with a polished aluminum finish if you prefer that instead, or you always have the option of powder coating it your own color. These tanks are TIG welded which will give strength and durability, and the aluminum will be stronger than the factory plastic tank. So not only will this tank offer an appearance upgrade but it will also be more durable and hold up better than a plastic tank, especially in high performance applications.Like the factory tank, this tank also has internal baffles. The internal baffles will keep the coolant from sloshing around, so this means during braking or high speed cornering, and since the coolant won't be sloshing around it will stay close to the overflow cord therefore helping to prevent coolant starvation and air from entering the system. Another cool thing this tank has is a sight tube. The sight tube allows you to keep an eye on your coolant level at a glance, which is important since this tank is a solid blacked-out tank. This thing will be your new best friend. The tank will come complete with an overflow nipple on the fill neck so you can attach more reservoirs if necessary. It's also a direct fit replacement that's going to work on an S550 V6, Ecoboost and GT so you won't have to worry about making room for this tank, and it reuses a stock overflow cap as well.As far as price, you're looking at spending just over $175 for this tank. The polished aluminum version is the same price so you'll have a choice of which you like better. The tank is nicely made and has some nice features like the hot and cold fill lines, and at the end of the day you're investing in an item that will improve both looks and it will last longer than the factory plastic tank.The install for this overflow tank is very easy. I mentioned that it's a direct bolt-on replacement, which means that it will just take the place of the factory overflow tank, and it does reuse the factory cap. You won't need any special tools to complete the install, just a few sockets, a flat head and hose clamp removers, and it will take less than an hour to complete, and I'm going to call it a one out of three wrenches on the difficulty meter.You will want to drain some of the coolant so you can pull up your stock expansion tank, so having some extra coolant to fill up with is a good idea. The factory tank uninstalls by removing 3 hoses and 2 10 millimeter bolts. It doesn't get much easier than this here. You can clamp your hose down if you want to make sure you don't leak any coolant, and the new tank installs the same way the factory one came out. One hose on the bottom, two bolts on the fan shroud and two hoses on the top of the tank. The stock cap can then be installed, and the install can be finished by topping off and bleeding the coolant system.Wrapping things up here, the Mishimoto Aluminum Coolant Expansion Tank will help you add some additional reliability by upgrading the materials of the expansion tank. It will also add some styling to the engine bay in either black or polished aluminum. It will eliminate the unattractive factory two-piece plastic tank and replace it with a single-piece design that utilizes a sight tube, and you can check it out more online right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Stronger Than Plastic Factory Tank
      • One-Piece Design
      • Black Powdercoat Finish
      • Aluminum Construction
      • Fully TIG Welded for Durability
      • Includes Sight Tube for Coolant Level
      • Direct Fit Replacement
      • Reuses Stock Overflow Cap
      • Fits All 2015-2023 Mustangs


      High Performance. Add additional strength and reliability to your S550 with this black powdercoat Mishimoto Aluminum Coolant Expansion Tank. Replace that weak plastic eye sore that came on your 2015-2023 Mustang, which is known to fail in high temperature situations, with this TIG-welded aluminum beauty. Improve both your underhood styling and coolant tank longevity with this Coolant Expansion Tank by Mishimoto.

      Durable Construction. Fully TIG-welded for durability and crafted from high strength 100% aluminum, this black powdercoated Mishimoto Coolant Expansion Tank will be much stronger, not to mention better looking, than the stock two-piece plastic tank. Featuring internal baffles to keep coolant from sloshing during high speed cornering, braking or acceleration, the baffles also help to prevent coolant starvation from the overflow ports on your S550 engine.

      Easy Installation. This Coolant Tank by Mishimoto has been designed as a direct fit replacement and comes complete with a sight tube to help keep an eye on your coolant levels at a glance. Complete with an overflow nipple on the fill neck to attach additional NHRA reservoirs if necessary, this tank comes with the necessary installation hardware for a simple install, taking just under an hour.

      Application. This black Mishimoto Aluminum Coolant Expansion Tank is designed to fit on 2015-2023 Mustangs and reuses the stock overflow tank cap.



      Mishimoto MMRT-MUS-15EBK

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Black Expansion Tank
      • (1) Sight Glass Tube
      • (1) Overflow hose
      • (3) Worn-Gear Clamps
      • Mounting Hardware

      Tech Specs


      Customer Reviews (262)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • EcoBoost - 23
        • GT - 23
        • Mach 1 - 23

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