Description
The Mishimoto Subaru WRX STI Oil Cooler Kit (MMOC-STI-15TBK) is a purpose-built oil cooling solution engineered specifically for the 2015 STI platform. Built around a large 19-row bar-and-plate cooler core, this kit mounts directly in the front bumper to capture maximum airflow, and it’s backed by real-world testing that shows a 20+ degree Fahrenheit (16+ degree Celsius) reduction in oil temperature with only minimal pressure loss.
Whether you’re chasing consistent lap times on track or simply want to protect your STI’s EJ257 engine from heat soak during spirited street driving, this Mishimoto oil cooler gives you the tools to keep oil temperatures in check. The kit pairs the 19-row cooler with preassembled stainless steel braided lines finished in -10AN male AN flare fittings, application-specific mounting brackets, and a thermal reflective wrap that shields the lines from radiant heat off the nearby exhaust. Buyers can further tailor the build by choosing between a Stealth Black or Sleek Silver anodized cooler finish and selecting either the standard Mishimoto Oil Sandwich Plate or the Mishimoto Thermostatic Oil Sandwich Plate, all while retaining the factory liquid-to-liquid oil cooler unit. As with every Mishimoto cooling product, this kit is covered by the Mishimoto Lifetime Warranty.
Vehicle Applications
This oil cooler kit is designed as a direct fit for the Subaru WRX STI, chassis code VA, equipped with the EJ257 engine. Coverage includes the 2015-2018 STI Base and Limited trims, the 2015 STI Launch Edition, and the 2016 STI Series.HyperBlue. Because this kit is designed around the single scroll turbo and unequal length exhaust manifold used on these models, it may not be compatible with STI variants equipped with a twin scroll turbo and equal length exhaust manifold.
Features
- 19-row bar-and-plate performance oil cooler core mounts in the front bumper for optimal airflow
- Reduces oil temperature by 20+ degrees Fahrenheit (16+ degrees Celsius) with minimal pressure loss
- Application-specific mounting brackets for a direct-fit installation
- 3.5-ft stainless steel braided hose with 150-degree -10AN fittings and 4-ft stainless steel braided hose with 90-degree and 150-degree -10AN fittings
- Thermal reflective wrap included to shield oil lines from exhaust heat
- Retains use of the factory liquid-to-liquid oil cooler unit
- Available in Stealth Black or Sleek Silver anodized cooler finish
- Choice of Mishimoto Oil Sandwich Plate or Mishimoto Thermostatic Oil Sandwich Plate
- M20 sandwich plate, M20 stainless steel sandwich plate adapter, M20 x -10AN straight fittings, and mounting hardware set included
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-STI-15TBK
- Product Type: Cooling
- Core Type: Bar-and-Plate
- Core Row Quantity: 19
- Core Height: 5.43 in
- Core Thickness: 1.97 in
- Core Width: 11 in
- Core Color: Black
- Finish: Anodized
- Grade Type: Performance
- Inlet Fitting Type: AN Flare, Male
- 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
How much does this kit lower oil temperature?
Testing shows a reduction of 20+ degrees Fahrenheit (16+ degrees Celsius) with minimal pressure loss.
What color options are available for the cooler?
The cooler is available in a Stealth Black or Sleek Silver anodized finish.
Can I choose a thermostatic sandwich plate?
Yes, you can select either the standard Mishimoto Oil Sandwich Plate or the Mishimoto Thermostatic Oil Sandwich Plate.
Which Subaru WRX STI models does this kit fit?
It fits the 2015-2018 STI Base and Limited trims, the 2015 STI Launch Edition, and the 2016 STI Series.HyperBlue, chassis code VA with the EJ257 engine.
Will this kit work with a twin scroll turbo STI?
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.
Is this kit covered by a warranty?
Yes, it is backed by 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.
