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The Mishimoto thermostatic oil cooler kit for the 2015 Subaru WRX STI installs a large 19‑row cooler with preassembled stainless lines and -10AN fittings plus a thermostatic sandwich plate option. Engineered to reduce oil temperatures by roughly 20°F while keeping minimal pressure loss, the kit includes thermal wrap for heat protection and is available in silver with Mishimoto’s lifetime warranty for street and track use.
Mishimoto 15 Subaru STI Thermostatic Oil Cooler Kit - Silver
