Description
The Mishimoto Oil Cooler Kit (MMOC-STI-15T) is a purpose-built 19-row oil cooler system engineered specifically for the 2015 Subaru WRX STI and its later single-scroll turbo siblings. Featuring a bar-and-plate core finished in anodized silver, this kit mounts directly in the front bumper for optimal airflow and is proven to drop oil temperatures by 20+°F (16+°C) while holding pressure loss to a minimum. Preassembled stainless steel braided lines terminate in -10AN male AN flare fittings and are wrapped in thermal reflective sleeving to shield them from nearby exhaust heat.
As part of Mishimoto’s Cooling product line, this mishimoto oil cooler kit is designed to keep engine oil temperatures in check during spirited street driving or track sessions, where sustained heat can rob power and shorten engine life. The kit retains the factory liquid-to-liquid oil cooler unit while adding dedicated air-to-oil cooling capacity, and it’s offered with a choice of Sleek Silver or Stealth Black cooler finishes plus either the standard Mishimoto Oil Sandwich Plate or the Mishimoto Thermostatic Oil Sandwich Plate for drivers who want temperature-regulated oil flow. Every configuration of this Mishimoto oil cooler ships with application-specific mounting brackets and a complete hardware set for a hassle-free bolt-in installation, and it’s backed by the Mishimoto Lifetime Warranty.
Vehicle Applications
This oil cooler kit is built for the 2015-2018 Subaru WRX STI Base and Limited trims, the 2015 WRX STI Launch Edition, and the 2016 WRX STI Series.HyperBlue, all sharing the EJ257 engine code and VA chassis code. Fitment is limited to models equipped with the single-scroll turbo and unequal-length exhaust manifold; STI models fitted with a twin-scroll turbo and equal-length exhaust manifold may not be compatible with this cooling kit.
Features
- 19-row bar-and-plate performance oil cooler core with an anodized silver finish
- Core measures 5.43 in. in height, 1.97 in. in thickness, and 11 in. in width
- Preassembled stainless steel braided lines with -10AN male AN flare fittings (3.5-ft hose with 150° fittings; 4-ft hose with 90° and 150° fittings)
- Application-specific mounting brackets and mounting hardware set for a direct-fit installation
- Includes M20 sandwich plate, M20 stainless steel sandwich plate adapter, and M20 x -10AN straight fittings
- Thermal reflective wrap included for heat deflection from nearby exhaust components
- Choice of Sleek Silver or Stealth Black cooler and standard or Thermostatic Oil Sandwich Plate
- Retains use of the stock liquid-to-liquid oil cooler unit
- Reduces oil temperatures by 20+°F (16+°C) while maintaining minimal pressure loss
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-STI-15T
- Core Type: Bar-and-Plate
- Core Row Quantity: 19
- Grade Type: Performance
- Core Height: 5.43 in
- Core Thickness: 1.97 in
- Core Width: 11 in
- Core Color: Silver / Finish: Anodized
- Inlet/Outlet Fitting Type: AN Flare, Male
- Engine Code: EJ257
- Chassis Code: VA
- Recommended torque for straight fittings and banjo bolts: 15-25 ft-lb; do not exceed 35 ft-lb
Frequently Asked Questions
What vehicles does the Mishimoto MMOC-STI-15T oil cooler kit fit?
It fits the 2015-2018 Subaru WRX STI Base and Limited, the 2015 WRX STI Launch Edition, and the 2016 WRX STI Series.HyperBlue.
How much does this kit reduce oil temperature?
Mishimoto states the kit is proven to reduce oil temperatures by 20+°F (16+°C) while maintaining minimal pressure loss.
Will this cooler work with any STI turbo setup?
No. This kit is designed for models with the single-scroll turbo and unequal-length exhaust manifold; STI models with a twin-scroll turbo and equal-length exhaust manifold may not be compatible.
What color options are available?
The cooler is available in Sleek Silver or Stealth Black.
What sandwich plate options come with this kit?
You can choose between the standard Mishimoto Oil Sandwich Plate or the Mishimoto Thermostatic Oil Sandwich Plate.
What is included in the kit?
The kit includes application-specific mounting brackets, a 19-row oil cooler, a 3.5-ft stainless steel braided hose with 150° -10AN fittings, a 4-ft stainless steel braided hose with 90° and 150° -10AN fittings, an M20 sandwich plate, an M20 stainless steel sandwich plate adapter, M20 x -10AN straight fittings, a mounting hardware set, and the Mishimoto Lifetime Warranty.
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.
