Mishimoto MMRT-TAC-24BK Aluminum Expansion Tank

The Mishimoto MMRT-TAC-24BK is a direct-fit aluminum expansion tank built specifically for the 2024, 2025, and 2026 Toyota Tacoma, 2024, 2025, and 2026 Toyota Land Cruiser LC250, and 2025 and 2026 Toyota 4Runner powered by the T24A-FTS 2.4L Turbo inline-4. This direct-fit pressurized degas reservoir replaces the factory plastic unit with a full TIG-welded 3A21 aluminum shell, a wrinkle-black powder coat finish, and a 46% capacity increase over OEM. Retailer SKU MISMMRT-TAC-24BK ships complete with worm gear clamps and a Mishimoto 1.3-bar radiator cap (MMRC-13-SMC) for a same-day bolt-on upgrade with no special tools. Every MISMMRT-TAC-24BK is backed by the Mishimoto Lifetime Warranty.

Why the MMRT-TAC-24BK Outperforms the Factory Plastic Tank

The OEM expansion tank on the 2024+ Tacoma and Land Cruiser LC250 is a molded plastic degas reservoir. Plastic works under normal operating conditions, but it has real limitations on a turbocharged engine driven hard: seams can develop micro-cracks, sustained heat cycling weakens the material over time, and the factory volume leaves less margin for coolant expansion during towing or extended off-road use.

MISMMRT-TAC-24BK addresses each of those failure points with a full aluminum construction strategy:

• 3A21 aluminum alloy shell, 100% TIG-welded: No crimped seams, no press-fit joints. Every weld is fusion-bonded, so the tank resists the same thermal cycling and pressure variation that degrades the OEM plastic unit over time.
• 46% greater coolant capacity: 4,377 mL versus the OEM 3,000 mL. The larger reservoir provides a greater thermal buffer, giving the cooling system more time to manage expansion before pressure or temperature reach critical levels.
• Internal anti-slosh baffling: Baffles inside the tank keep coolant volume near the overflow port during steep inclines, off-camber trails, and hard cornering. Without baffling, the liquid surface can tip far enough to expose the port to air, causing air ingestion into the cooling circuit.
• Integrated air diverter tube: An internal tube actively routes air to the top of the tank, so the system draws liquid coolant rather than air pockets when the engine demands flow.
• Included 1.3-bar radiator cap (MMRC-13-SMC): Raising system pressure from the stock cap rating increases the coolant boiling point, expanding thermal headroom under load. The MMRC-13-SMC is a direct swap onto the MMRT-TAC-24BK tank neck.
• Integrated sight glass: A built-in sight glass lets you check coolant level at a glance without removing the cap. Center of the sight glass marks the cold-fill reference line, so monitoring after install is fast and safe.
• Wrinkle-black powder coat finish: Resists corrosion and cleans up the engine bay. The finish replaces the translucent plastic OEM tank with a consistent, purposeful look that matches other Mishimoto 2024+ Tacoma components.

3A21 Aluminum Construction

Mishimoto specifies 3A21 aluminum alloy for the MMRT-TAC-24BK for good reason. 3A21 is a commercially pure aluminum with excellent corrosion resistance and high formability, making it a standard material choice for automotive heat exchangers and fluid tanks. All seams are fully TIG-welded, not crimped or press-fit, which is the construction method that matters most for a pressurized coolant system. The external wrinkle-black powder coat layer adds a second layer of corrosion protection and keeps the finish consistent across hot-cold cycles. Dimensions are 10.6 inches tall by 6.74 inches wide, matching the OEM envelope for a direct-fit installation without bracket modification.

What's Included

• 1x Mishimoto MMRT-TAC-24BK aluminum expansion tank
• 2x worm gear clamps
• 1x Mishimoto 1.3-bar radiator cap (MMRC-13-SMC)

Fitment: 2024-2026 Toyota Tacoma, Land Cruiser LC250, and 2025-2026 4Runner

MISMMRT-TAC-24BK fits all trim levels of the 2024-2026 Toyota Tacoma (including i-Force Max hybrid), 2024-2026 Toyota Land Cruiser LC250, and 2025-2026 Toyota 4Runner (8th gen, including i-Force Max hybrid) equipped with the T24A-FTS 2.4L Turbo inline-4 engine. Confirm your engine code before ordering. This expansion tank fits both the standard T24A-FTS and the i-Force Max hybrid variant of that engine in all three nameplates.

Full Specifications

Lifetime Warranty and Factory Warranty Protection

Every MMRT-TAC-24BK ships with Mishimoto's Lifetime Warranty covering the original purchaser for the life of the product, including accident protection. Mishimoto is a US-based company headquartered in New Castle, Delaware, and stands behind every product with direct warranty support.

Installing the MISMMRT-TAC-24BK will not void your Toyota factory powertrain warranty. The federal Magnuson-Moss Warranty Act prohibits a manufacturer from voiding your warranty solely because you installed an aftermarket part. Toyota would need to demonstrate that the specific aftermarket part directly caused the specific failure being claimed, and a coolant expansion tank replacement does not modify any emissions, fuel, or powertrain control system. If a dealer raises a warranty concern after installation of this tank, reference the Magnuson-Moss Warranty Act (15 U.S.C. § 2302).

California Residents: This product contains chemicals known to the State of California to cause cancer and reproductive harm. See www.p65warnings.ca.gov.

Installation Overview

The MMRT-TAC-24BK is a direct-fit bolt-on replacement rated 2 out of 5 for installation difficulty. Most installers complete the job in 30 to 60 minutes using only basic hand tools. No welding, cutting, or drilling is required. The kit includes all necessary hardware.

• Allow the engine to cool completely before beginning. The cooling system is pressurized and hot coolant causes serious burns.
• Drain or catch existing coolant before disconnecting hoses from the OEM tank.
• Disconnect hose connections and mounting hardware from the factory plastic tank and remove it.
• Position the MMRT-TAC-24BK aluminum tank in the OEM location. It is designed for direct-fit placement without bracket modification.
• Reconnect hoses using the included worm gear clamps. Torque clamps snugly without overtightening.
• Install the included Mishimoto MMRC-13-SMC 1.3-bar cap onto the tank neck.
• Refill the cooling system to the sight glass center line (cold-fill reference).
• After a few hot-and-cold cycles, recheck the sight glass to confirm proper coolant level.

About Mishimoto

Mishimoto is a US-based performance cooling company headquartered in New Castle, Delaware. Since 2005, Mishimoto has focused on engineering high-performance cooling components including aluminum radiators, intercoolers, oil coolers, and coolant expansion tanks for specific vehicle applications. Every product in the Mishimoto lineup undergoes application-specific engineering and fitment testing. The MMRT-TAC-24BK is part of a broader Mishimoto cooling ecosystem for the 2024+ Toyota Tacoma T24A-FTS platform that includes the MMINT-TAC-24BK performance intercooler and the MMICP-TAC-24BK intercooler pipe kit, all designed to work on the same engine family.

Frequently Asked Questions

Does the MISMMRT-TAC-24BK fit the 2024 Toyota Tacoma i-Force Max hybrid?
Yes. This tank fits both the standard T24A-FTS 2.4L Turbo and the i-Force Max hybrid variant. Both versions share the same T24A-FTS engine block and expansion tank mounting, so fitment is confirmed for all 2024, 2025, and 2026 Tacoma trims, including TRD Pro, TRD Off-Road, Trailhunter, and the i-Force Max hybrid.

Does the MMRT-TAC-24BK fit the 2024 and 2025 Toyota Land Cruiser LC250?
Yes. The LC250 uses the same T24A-FTS 2.4L Turbo engine as the Tacoma, and Mishimoto confirmed fitment for the 2024, 2025, and 2026 Land Cruiser LC250 in all trims, including the 1958 Edition, Base, and the 2024 First Edition.

Does MISMMRT-TAC-24BK fit the 2025 Toyota 4Runner?
Yes. The 8th-generation 4Runner launched for 2025 with the T24A-FTS 2.4L Turbo, and Mishimoto confirmed fitment for 2025 and 2026 model years across all trims, including both the standard and i-Force Max hybrid variants. Note: the 7th-generation 4Runner (2010 to 2024) uses a different engine and does not fit.

What is the capacity difference between the MMRT-TAC-24BK and the stock OEM expansion tank?
The Mishimoto tank holds 4,377 mL (148 fl oz), compared to the OEM plastic tank at 3,000 mL (101 fl oz). That is a 1,377 mL increase, or approximately 46% more coolant capacity than the factory unit. The larger volume provides a greater thermal buffer and more margin for coolant expansion under sustained load or towing.

Is this expansion tank a direct fit, or does it require bracket modification?
It is a direct fit. The MMRT-TAC-24BK is engineered to the OEM envelope at 10.6 inches tall by 6.74 inches wide, replacing the factory plastic tank in the same mounting location without bracket fabrication or drilling. The kit includes all necessary hardware. No welding is required.

What radiator cap is included with this tank?
The kit includes the Mishimoto MMRC-13-SMC 1.3-bar (18.9 psi) high-pressure radiator cap. The stock Toyota cap typically runs at a lower pressure rating. A higher system pressure raises the coolant boiling point, increasing thermal headroom under load. The MMRC-13-SMC is designed for direct fitment onto the MMRT-TAC-24BK tank neck.

Will this coolant tank upgrade void my Toyota factory warranty?
No. Under the federal Magnuson-Moss Warranty Act (15 U.S.C. § 2302), Toyota cannot void your factory powertrain warranty simply because you replaced the coolant expansion tank with an aftermarket unit. They would need to prove the specific part caused the specific failure being claimed. A pressurized degas reservoir replacement does not affect the engine, transmission, emissions system, or any other powertrain component. If a dealer suggests otherwise, reference the Magnuson-Moss Warranty Act directly.

How long does installation take, and what tools are needed?
Most installers complete the MMRT-TAC-24BK swap in 30 to 60 minutes. The install is rated 2 out of 5 for difficulty and requires only basic hand tools: a socket set and screwdrivers for the worm gear clamps and mounting hardware. No special tools, no welding, no cutting. Coolant catch pan recommended. Allow the engine to cool fully before starting.

Does the MMRT-TAC-24BK carry a California Prop 65 warning?
Yes. This product carries a California Proposition 65 warning. California Residents: This product contains chemicals known to the State of California to cause cancer and reproductive harm. See www.p65warnings.ca.gov.

Is the MMRT-TAC-24BK made in the USA?
No. The MMRT-TAC-24BK is manufactured in China. Mishimoto is a US-based company headquartered in New Castle, Delaware, and the product is engineered, tested, and warranted by Mishimoto in the United States, but the physical product is produced in China.

Are there other colors or finishes available for this expansion tank?
At the time of this listing, MMRT-TAC-24BK in wrinkle-black is the only available finish for the 2024+ Tacoma, Land Cruiser LC250, and 4Runner application. No natural, polished, or red variants have been released for this fitment. Check back with Black Ops Auto Works as Mishimoto expands their lineup for this platform.