Engineered specifically for 2011 through 2025 Ford F-250, F-350, and F-450 Super Duty trucks equipped with the 6.7L Powerstroke turbo diesel engine, the Mishimoto Aluminum Secondary Expansion Degas Tank (MMRT-F2D-11SMWBK) permanently resolves the plastic degradation issues found on factory tanks. The Super Duty's secondary low-temperature cooling loop is tasked with protecting vital components, including the air-to-water charge air cooler (CAC), fuel cooler, transmission fluid heat exchanger, and secondary EGR circuits.

Over years of severe under-hood heat cycles and vibrations, the factory translucent plastic secondary reservoir turns yellow, becomes brittle, and develops hairline stress fractures around the mounting brackets and lower neck fittings. The Mishimoto replacement is 100% precision TIG-welded from durable 5052 aircraft-grade aluminum and finished in a tough micro-wrinkle black powder coat. Engineered with internal anti-slosh baffling, this expansion tank prevents coolant starvation during aggressive braking and off-road maneuvering, while an integrated side sight glass allows effortless fluid level checks.

Key Features & Benefits

• All-Aluminum Construction: Built entirely from 100% TIG-welded 5052 aluminum to eliminate plastic tank cracking, brittle hose barb failures, and dangerous coolant leaks.
• 15.65% Increased Fluid Capacity: Expands the secondary low-temperature cooling reservoir volume to improve heat absorption and thermal stability.
• Integrated Anti-Aeration Baffles: Internal baffle plates prevent fluid slosh away from the main supply port and eliminate air ingestion into the secondary coolant loop.
• Built-In Sight Tube: Incorporates an external clear sight glass allowing quick visual verification of cold and hot fluid levels without opening the cap.
• Micro-Wrinkle Black Finish: Durable powder-coated finish resists salt corrosion, scratches, and harsh under-hood automotive chemicals.
• Direct Drop-In Bolt-On: Engineered to utilize factory mounting points and OEM secondary coolant hoses with zero cutting or modifications.

Technical Specifications

• Manufacturer Part Number / SKU: MMRT-F2D-11SMWBK / MIS-MMRT-F2D-11SMWBK
• Material Construction: 100% TIG-Welded 5052 Aircraft-Grade Aluminum
• Finish: Durable Micro-Wrinkle Black Powder Coat
• Cooling Circuit: Secondary Low-Temperature Loop (Charge Air Cooler / Fuel Cooler / Trans Cooler)
• Capacity Gain: +15.65% Greater Coolant Volume Over OEM
• Sight Glass: Exterior Clear Fluid Level Sight Tube Included
• Truck Platform: 2011–2025 Ford Super Duty F-250, F-350, F-450
• Engine Platform: 6.7L Powerstroke V8 Turbo Diesel
• Core Requirement: None
• Warranty: Mishimoto Lifetime Manufacturer Warranty

Vehicle Fitment & Installation Notes

• 2011–2025 Ford F-250 Super Duty – 6.7L Powerstroke Turbo Diesel
• 2011–2025 Ford F-350 Super Duty – 6.7L Powerstroke Turbo Diesel
• 2011–2025 Ford F-450 Super Duty – 6.7L Powerstroke Turbo Diesel
• Fits Model Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
• Fitment Notice: Engineered specifically for the secondary low-temperature cooling system reservoir. Does not replace the primary high-temperature engine block degas tank (pair with Mishimoto primary tank SKU MMRT-F2D-11PMWBK). Reuses the factory secondary pressure cap or accepts an OEM direct replacement.
• Installation Tip: When draining and refilling the secondary cooling circuit, use a vacuum fill tool to pull a continuous vacuum. This prevents airlock within the air-to-water intercooler core and secondary radiator before bringing the engine up to operating temperature.