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 Degas Expansion Tank (Base Series: MMRT-F2D-11S) permanently replaces the crack-prone factory plastic reservoir. Ford designed the 6.7L Powerstroke with an independent secondary low-temperature cooling loop dedicated to maintaining optimal temperatures for the air-to-water charge air cooler (CAC), fuel cooler, transmission heat exchanger, and secondary EGR cooler circuit.

Under severe engine bay heat cycles, heavy towing strain, and chassis vibration, the factory translucent plastic tank degrades, turns brittle, discolors, and develops stress fractures along molded seams and mounting tabs. The Mishimoto replacement is 100% precision TIG-welded from aircraft-grade 5052 aluminum to eliminate plastic blowouts completely. Featuring internal anti-aeration baffles, an integrated fluid level sight glass, and 15.65% more volume than OEM, this expansion tank is available in both a bare natural aluminum finish and a stealth micro-wrinkle black powder coat.

Selectable Finish Options & SKU Breakdown

• Natural Bare Aluminum (SKU: MMRT-F2D-11SN): Features a clean, brushed raw-aluminum finish that can be installed as-is, hand-polished to a mirror shine, or custom paint-matched and hydro-dipped for custom engine bays.
• Micro-Wrinkle Black Powder Coat (SKU: MMRT-F2D-11SMWBK): Features an OEM-plus textured black powder-coated finish designed to resist scratches, chemical staining, and corrosion while blending cleanly with factory engine bay plastics.

Key Features & Benefits

• Durable Aircraft-Grade Aluminum: Replaces failure-prone OEM plastic with 100% TIG-welded 5052 aluminum to eliminate cracking, leaks, and yellowing.
• 15.65% Increased Coolant Capacity: Expands fluid reserve capacity to improve heat dissipation across the charge air cooler and fuel cooler under high-load pulling.
• Internal Anti-Slosh Baffles: Internal baffle plates keep secondary coolant situated over the lower feed port to eliminate air ingestion during hard launches and emergency stops.
• Integrated Fluid Sight Glass: Built-in side sight tube allows instant visual inspection of cold and hot coolant levels without opening a hot reservoir.
• Direct Drop-In Bolt-On: Engineered to align with factory mounting brackets and connect to OEM secondary coolant lines without modifications.
• Threaded Filler Neck: Works with the factory secondary reservoir cap or an OEM-specification direct replacement cap.

Technical Specifications

• Parent Product ID: MIS-MMRT-F2D-11S
• Child SKUs: MMRT-F2D-11SN (Natural Aluminum) | MMRT-F2D-11SMWBK (Micro-Wrinkle Black)
• Cooling Circuit Supplied: Secondary Low-Temperature Loop (Intercooler / Fuel Cooler / Transmission Exchanger)
• Fluid Capacity: +15.65% Increase Over Factory Reserve Volume
• Material Construction: 100% TIG-Welded 5052 Aircraft-Grade Aluminum
• Fluid Level Indicator: External Clear Sight Tube Pre-Installed
• 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: Dedicated specifically to the secondary low-temperature cooling system reservoir. Does not replace the primary high-temperature engine block degas tank (pair with Mishimoto primary tank series MMRT-F2D-11P).
• Installation Tip: When bleeding the secondary circuit, use a cooling system vacuum filling apparatus to pull a deep vacuum on the loop before refilling. This eliminates stubborn airlocks inside the liquid-to-air charge air cooler core.