Mishimoto Aluminum Expansion Tank Wrinkle Red Focus ST RS

Function: The Mishimoto Aluminum Expansion Tank (Wrinkle Red) for Focus ST/RS provides a reliable coolant overflow and surge reservoir, improving system reliability and engine bay presentation for performance-oriented vehicles.

This engineered replacement tank from Mishimoto is designed to address coolant containment and overflow behavior while delivering a purpose-built aesthetic. It complements turbo upgrade and performance exhaust environments where consistent cooling response matters.

• Internal baffles — Prevent coolant starvation from overflow ports on the engine; this maintains coolant availability under varied operating conditions and helps stabilize reservoir behavior during normal and spirited driving.
• Aluminum construction — Built from aluminum for a durable, serviceable replacement component that integrates with performance cooling systems and resists the wear associated with stock plastic tanks.
• Wrinkle Red finish — Provides engine bay styling consistent with motorsports aesthetics while offering a textured surface that conceals surface imperfections and resists visual fading.
• Mishimoto engineering — Developed by Mishimoto to meet fitment and functional expectations for Focus RS and ST applications, aligning with brand reputation for performance cooling components.

Why this matters

Coolant management is critical to maintaining stable temperatures and protecting turbocharged, high-output engines. The included internal baffles directly address coolant movement and overflow behavior, reducing the risk of temporary coolant starvation at the engine's overflow ports during demanding driving. The aluminum body and purpose-built finish contribute to long-term serviceability and consistent engine bay appearance.

Compatibility — Designed specifically for Focus ST and Focus RS models, providing a direct-replacement installation that integrates with existing cooling lines and mounting points.

Package details

Vendor: Mishimoto