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Mishimoto Oil Cooler Kit – 2002-2005 WRX / 2004-2005 STI


Mishimoto Oil Cooler Kit – 2002-2005 WRX / 2004-2005 STI


  • Direct fit for the 2008-2014 Subaru WRX
  • Proven 25 F (13.9 C) drop in oil temperature
  • Full bolt-on oil cooling solution for street and track vehicles
  • No modification necessary for installation, functions with all stock equipment
  • 19-row oil cooler strategically mounted in the lower grille for maximum airflow
  • CNC-machined application-specific sandwich plate
  • Works in conjunction with stock liquid-to-liquid heat exchanger for proper fluid warm-up and regulation
  • Includes preassembled stainless steel braided oil lines with -10AN fittings
  • Cooler available in Sleek Silver or Stealth Black
  • Increases oil capacity by 0.75 qt
  • This oil cooler kit retains the use of your stock liquid to liquid oil cooler unit
  • Mishimoto Lifetime Warranty


Authorized Dealer


Whether you have a rally-inspired WRX or a built STI, maintaining ideal oil temperatures is necessary for both optimal performance and engine longevity. Treat your flat-four to a dose of reliability with the Mishimoto Subaru WRX/STI Direct-Fit Oil Cooler Kit. This kit includes precision-engineered, application-specific mounting brackets, premade stainless steel braided oil lines, a billet oil sandwich plate, an efficient 10-row stacked-plate Mishimoto oil cooler, and all necessary hardware.
This kit provides .5 qt of additional oil capacity and reduces temperatures by more than 20°F (16°C) while providing minimal pressure loss. This kit is available with the Mishimoto standard Oil Sandwich Plate or the Mishimoto Oil Sandwich Plate with Rear-Mounted Thermostat for additional oil temperature control and optimal performance in any environment. For additional customization, this kit is available with your choice of either a Sleek Silver or Stealth Black cooler.
This kit is the perfect complement to the Mishimoto Subaru WRX/STI Performance Aluminum Radiator and Silicone Radiator Hose Kit for the ultimate cooling solution for your Subaru. As with all our products, this kit includes the Mishimoto Lifetime Warranty.


  • Application-Specific Mounting Brackets
  • 10-Row Oil Cooler
  • 3-ft Stainless Steel Braided Hose w/ -10AN Fittings
  • 4-ft 4-in Stainless Steel Braided Hose w/ -10AN Fittings
  • Oil Sandwich Plate
  • Stainless Steel Sandwich Plate Adapter, M20
  • Banjo Fitting w/ Bolt M20 x -10AN, Black
  • Black Rubber Seal
  • Mounting Hardware Set
  • Mishimoto Lifetime Warranty


Requires trimming of exhaust heat shield for proper installation. Will not fit on vehicles equipped with front mount intercoolers. Fits automatic and manual applications.


Additional Information

Weight 11.2 lbs
Dimensions 18.6 × 15 × 8.4 in
Cooler Color & Thermostatic Options

Silver, Non Thermostatic, Black, Non Thermostatic, Silver, Thermostatic, Black Thermostatic


  • 2002-2005 WRX
  • 2004-2005 STI


Installation Notes

Torque Specs

Recommended torque specification for all straight fittings and banjo bolts: 15-25 lb-ftDo not exceed the maximum torque rating of 35 ft-lb

Please Note

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.

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.