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The Mishimoto aluminum expansion tank for 2013–2018 Ford Focus ST and 2016–2018 Focus RS (Wrinkle Blue) upgrades the stock plastic reservoir with TIG‑welded aluminum for increased durability and engine‑bay appearance. Internal baffles prevent coolant starvation during high‑G maneuvers and a sight tube makes level checks simple. It reuses the factory cap, includes an overflow nipple, installs in under an hour, and is backed by Mishimoto’s Lifetime Warranty.
Mishimoto 2013+ Ford Focus ST/2016+ Focus RS Aluminum Expansion Tank - Wrinkle Blue
