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 in Natural Finish (MMRT-F2D-11SN) offers a permanent metallic solution to fragile OEM plastic reservoirs. The 6.7L Super Duty utilizes an independent low-temperature secondary cooling system dedicated to managing heat rejection for the liquid-to-air charge air cooler (CAC), fuel cooler, transmission fluid exchanger, and secondary EGR cooler.

Over repeated high-temperature duty cycles, the original factory plastic secondary tank becomes brittle, discolors, and develops stress cracks near the mounting tabs and hose barbs. Built from robust 5052 aircraft-grade aluminum, this tank eliminates cracking hazards while providing a clean, raw aluminum finish that can be installed as-is, hand-polished, or custom powder-coated. The tank features internal anti-slosh baffles to prevent aeration at the supply port, an integrated sight glass for fast fluid level checks, and an expanded design that holds 15.65% more coolant than stock.

Key Features & Benefits

• TIG-Welded 5052 Aircraft Aluminum: Replaces failure-prone factory plastic with strong aluminum that will not crack, warp, or degrade from under-hood heat.
• 15.65% Greater Coolant Capacity: Expands secondary cooling fluid volume to enhance thermal stability across the charge air cooler and fuel cooler circuits.
• Internal Anti-Aeration Baffles: Prevents coolant slosh away from the pickup port during hard launches, emergency braking, and steep-angle off-road driving.
• Integrated Clear Sight Tube: Built-in side sight glass allows effortless inspection of cold and hot fluid levels without opening the cooling system.
• Customizable Natural Finish: Clean raw-aluminum surface is ready for immediate drop-in installation or custom polishing, paint-matching, and powder-coating.
• Factory Bolt-On Compatibility: Installs using existing factory mounting points and connects to OEM hoses with zero cutting or drilling.

Technical Specifications

• Manufacturer Part Number / SKU: MMRT-F2D-11SN / MIS-MMRT-F2D-11SN
• Material Construction: 100% TIG-Welded 5052 Aircraft-Grade Aluminum
• Surface Finish: Natural Raw Aluminum (Brushed/Bare)
• Cooling Circuit Filtered/Supplied: Secondary Low-Temperature Circuit (Intercooler / Fuel Cooler / Trans Exchanger)
• Fluid Capacity: +15.65% Over Factory OEM Tank
• Sight Glass: External Pre-Installed Clear 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-11PN). Reuses the factory secondary cap or accepts an OEM direct replacement.
• Installation Tip: When refilling the secondary circuit, use a cooling system vacuum bleeder to pull a complete vacuum on the loop before filling. This eliminates air pockets trapped inside the secondary radiator and charge air cooler core.