Description
The Mishimoto Subaru WRX/STI Direct-Fit Oil Cooler Kit (MMOC-WRX-01T) is a purpose-built cooling upgrade engineered specifically for the EJ205 and EJ255 flat-four engines found in Subaru’s rally-bred lineup. Built around a 10-row stacked-plate, bar-and-plate cooler core, this kit is designed to pull excess heat out of the oil circuit while adding roughly half a quart of extra oil capacity, giving the engine more thermal buffer during hard driving. Every bracket, hose, and fitting is application-specific, so this is a true direct-fit Mishimoto cooler rather than a universal piece that requires improvisation.
This Mishimoto oil cooler kit is engineered to reduce oil temperatures by more than 20 degrees Fahrenheit while keeping pressure loss to a minimum, helping protect engine internals from the extra heat generated by spirited or track driving. It pairs premade stainless steel braided oil lines with a billet oil sandwich plate, and you can choose the standard sandwich plate or upgrade to the version with a rear-mounted thermostat for finer control of oil temperature across varying conditions. For shoppers building out a complete Mishimoto Cooling setup, this oil cooler kit is designed to complement the Mishimoto Subaru WRX/STI Performance Aluminum Radiator, Performance Aluminum Fan Shroud Kit, and Silicone Radiator Hose Kit.
Vehicle Applications
This Mishimoto oil cooler kit is a direct-fit application for the 2002–2005 Subaru Impreza WRX and the 2004–2005 Subaru Impreza WRX STI, both built on the GD chassis and equipped with the EJ205 or EJ255 engine. The kit is designed to fit both automatic and manual transmission applications, though installation requires trimming of the exhaust heat shield, and the kit will not fit vehicles equipped with front-mount intercoolers.
Features
- 10-row stacked-plate, bar-and-plate oil cooler core with a silver anodized finish
- Application-specific mounting brackets engineered for a true direct-fit installation
- Premade stainless steel braided oil lines, including a 3-ft line and a 4-ft 4-in line, each with -10AN fittings
- Billet oil sandwich plate, available in a standard version or with a rear-mounted thermostat for added temperature control
- Cooler available in Sleek Silver or Stealth Black finish options
- Adds approximately 0.5 qt of additional oil capacity to the system
- Reduces oil temperature by more than 20°F with minimal pressure loss
- Includes a stainless steel sandwich plate adapter (M20), a black banjo fitting with bolt (M20 x -10AN), a black rubber seal, and a full mounting hardware set
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Core Type: Bar-and-Plate
- Core Row Quantity: 10-row
- Core Height: 2.76 in
- Core Thickness: 1.97 in
- Core Length: 11 in
- Overall Width: 12 in
- Overall Height: 10 in
- Overall Length: 11 in
- Core Color: Silver
- Finish: Anodized
- Grade Type: Performance
- Inlet/Outlet Fitting Type: AN Flare
- Inlet/Outlet Fitting Gender: Male
- Engine Codes: EJ205, EJ255
- Chassis Code: GD
- Recommended torque for straight fittings and banjo bolts: 15-25 lb-ft (do not exceed 35 ft-lb)
Frequently Asked Questions
Which vehicles does this Mishimoto oil cooler kit fit?
This kit is a direct fit for the 2002–2005 Subaru Impreza WRX and the 2004–2005 Subaru Impreza WRX STI, both on the GD chassis with EJ205 or EJ255 engines.
How much does this kit lower oil temperature?
According to Mishimoto, this oil cooler kit reduces oil temperatures by more than 20 degrees Fahrenheit while providing minimal pressure loss.
What color options are available for the cooler?
The kit is available with your choice of a Sleek Silver or Stealth Black cooler.
Does this kit offer a thermostat option?
Yes, this kit is available with the standard Mishimoto Oil Sandwich Plate or with the Oil Sandwich Plate featuring a Rear-Mounted Thermostat for additional oil temperature control.
What is included in the Mishimoto oil cooler kit?
The kit includes application-specific mounting brackets, a 10-row oil cooler, a 3-ft and a 4-ft 4-in stainless steel braided hose with -10AN fittings, an oil sandwich plate, a stainless steel sandwich plate adapter (M20), a banjo fitting with bolt (M20 x -10AN, black), a black rubber seal, mounting hardware, and the Mishimoto Lifetime Warranty.
Are there any installation notes to be aware of?
Installation requires trimming of the exhaust heat shield, and the kit will not fit vehicles equipped with front-mount intercoolers. It fits both automatic and manual transmission applications.
âš WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
