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THERMOSTATIC- Includes thermostatic billet anodized aluminum sandwich plate

NON-THERMOSTATIC- Includes standard aluminum sandwich plate



  • 20 F (16 C) temperature drop
  • Minimal pressure loss
  • Direct fit for the 2015-2021 STI
  • This oil cooler kit retains the use of your stock liquid to liquid oil cooler unit
  • Sleek Silver or Stealth Black cooler options
  • Thermostatic option available
  • Mishimoto Lifetime Warranty


The Subaru STI provides a great balance of power, handling, and reliability. As with any vehicle, controlling fluid temperatures will ensure consistent power and engine longevity. The Mishimoto Subaru STI Oil Cooler Kit was developed specifically for the 2015-2021 STI and is a great addition to any street or track-driven vehicle.


A large Mishimoto 19-row cooler mounts in the front bumper to provide optimal airflow and cooling efficiency. The included direct-fit mounting brackets and preassembled stainless steel lines with -10AN fittings will ensure an easy and hassle-free installation.


This Mishimoto cooler is proven to reduce oil temperatures by 20+°F (16+°C) while maintaining minimal pressure loss. For further heat protection, this Mishimoto Subaru Oil Cooler Kit includes thermal reflective wrap for the oil lines, providing substantial heat deflection from the nearby exhaust and, as with every Mishimoto oil cooler, this oil cooler kit includes the Mishimoto Lifetime Warranty so you can have peace of mind!!


-It is the installer's responsibility to check all thermostat plugs, NPT plugs, line fittings, and other connections to assure they are fully tightened before operating the vehicle. Mishimoto recommends that you check all connections at regular intervals, especially during the first few miles after installation.



-Recommended torque specification for all straight fittings and banjo bolts: 15-25 lb-ft

-Do not exceed the maximum torque rating of: 35 ft-lb

-Mishimoto fully inspects and cleans all products prior to packaging. However, it is recommended that customers flush the oil cooler with one quart of clean oil prior to installation to remove any debris accumulated during shipping.

-This oil cooler kit will only work with models with the single scroll turbo and un-equal length exhaust manifold. Models with a twin scroll turbo and equal length exhaust manifold may not be compatible with this oil cooler kit.




ROWS  19
INLET                               -10AN
OUTLET                               -10AN



Fits 2015-2021 STI with EJ257 Engine codes




Mishimoto Direct-Fit Performance Oil Cooler Kit 2015-2021 STI

PriceFrom C$1,000.00
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