Description
The Mishimoto MMOC-STI-15BK Oil Cooler Kit is a black, non-thermostatic 19-row bar-and-plate oil cooler built specifically for the Subaru WRX STI’s EJ257 engine. Mounting in the front bumper for maximum airflow, this Mishimoto oil cooler is proven to drop oil temperatures by 20+ degrees Fahrenheit (16+ degrees Celsius) while keeping pressure loss to a minimum, making it a genuine upgrade for STI owners who drive hard on the street or at the track.
As part of Mishimoto’s Cooling lineup, this oil cooler kit pairs a black anodized, bar-and-plate core with preassembled stainless steel braided lines and -10AN male AN Flare fittings, so installation stays straightforward instead of becoming a custom fabrication project. Because the kit retains your STI’s stock liquid-to-liquid oil cooler unit, it adds cooling capacity without forcing removal of factory equipment, and the included thermal reflective line wrap helps shield the stainless hoses from radiant heat coming off the nearby exhaust. Buyers can further tailor this Mishimoto oil cooler kit to their build, choosing between a Stealth Black or Sleek Silver core along with either the standard Mishimoto Oil Sandwich Plate or the Mishimoto Thermostatic Oil Sandwich Plate, and every configuration is backed by the Mishimoto Lifetime Warranty.
Vehicle Applications
This Mishimoto oil cooler kit is designed to fit the Subaru WRX STI Base and Limited trims from 2015 through 2018, the 2015 WRX STI Launch Edition, and the 2016 WRX STI Series.HyperBlue. It is built around the EJ257 engine and VA chassis, and Mishimoto notes that this kit works only with STI models equipped with a single scroll turbo and unequal length exhaust manifold; STI models with a twin scroll turbo and equal length exhaust manifold may not be compatible with this cooler kit.
Features
- 19-row bar-and-plate oil cooler core with a black anodized finish, mounted in the front bumper for optimal airflow
- Reduces oil temperatures by 20+ degrees Fahrenheit (16+ degrees Celsius) while maintaining minimal pressure loss
- Application-specific mounting brackets for a direct-fit installation on the 2015+ STI
- Preassembled stainless steel braided lines with -10AN male AN Flare fittings, including a 3.5-ft hose with 150-degree fittings and a 4-ft hose with 90-degree and 150-degree fittings
- Thermal reflective wrap included for the oil lines to deflect heat from the nearby exhaust
- Retains use of the stock liquid-to-liquid oil cooler unit
- Includes M20 sandwich plate, M20 stainless steel sandwich plate adapter, and M20 x -10AN straight fittings
- Available with a Sleek Silver or Stealth Black cooler and an optional Thermostatic Oil Sandwich Plate
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-STI-15BK
- Product Type: Cooling
- Color / Core Color: Black
- Finish: Anodized
- Core Type: Bar-and-Plate
- Core Row Quantity: 19
- Core Height: 5.43 in
- Core Thickness: 1.97 in
- Core Width: 11 in
- Grade Type: Performance
- Inlet Fitting Type: AN Flare, Male
- Outlet Fitting Type: AN Flare, Male
- Engine Code: EJ257
- Chassis Code: VA
- Recommended Torque: 15-25 ft-lb for straight fittings and banjo bolts (do not exceed 35 ft-lb)
Frequently Asked Questions
What vehicles does this Mishimoto oil cooler kit fit?
It fits the Subaru WRX STI Base and Limited trims from 2015-2018, the 2015 WRX STI Launch Edition, and the 2016 WRX STI Series.HyperBlue.
How much does this cooler lower oil temperature?
Mishimoto states the cooler is proven to reduce oil temperatures by 20+ degrees Fahrenheit (16+ degrees Celsius) while maintaining minimal pressure loss.
What’s included with the Mishimoto oil cooler kit?
The kit includes application-specific mounting brackets, a 19-row oil cooler, a 3.5-ft stainless steel braided hose with 150-degree -10AN fittings, a 4-ft stainless steel braided hose with 90-degree and 150-degree -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.
Is this kit compatible with all STI turbo configurations?
This kit works with STI models equipped with a single scroll turbo and unequal length exhaust manifold. Models with a twin scroll turbo and equal length exhaust manifold may not be compatible.
What is the recommended torque for the fittings?
Mishimoto recommends a torque of 15-25 ft-lb for all straight fittings and banjo bolts, and cautions against exceeding 35 ft-lb.
What warranty comes with this Mishimoto oil cooler kit?
This kit includes 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.
