Description
The Mishimoto MMOC-STI-08T is a direct-fit 19-row oil cooler kit engineered specifically for the Subaru WRX STI, pairing a large front-bumper-mounted cooler with preassembled stainless steel lines to keep oil temperatures in check on the street or at the track. Built around a Bar-and-Plate, Performance-grade core finished in Silver with an Anodized finish, this Mishimoto cooler kit is designed to bolt in using application-specific mounting brackets, no guesswork required.
Controlling fluid temperatures is essential to consistent power delivery and long-term engine health, and this Mishimoto oil cooler kit addresses that directly. The 19-row core mounts in the front bumper for optimal airflow, while stainless steel braided lines terminate in -10AN Male AN Flare fittings for a secure, leak-resistant connection. Mishimoto states this cooler kit reduces oil temperatures by 20 to 30 degrees, including a documented 20°F (16°C) temperature drop, all while maintaining minimal pressure loss. Included thermal reflective wrap shields the oil lines from radiant heat generated by nearby exhaust components, adding another layer of thermal protection. Buyers can further tailor the kit with either a black or silver cooler finish and the option to add an M20 thermostatic sandwich plate for more precise oil temperature regulation, and the kit retains use of the vehicle’s stock liquid-to-liquid oil cooler unit.
Vehicle Applications
This Mishimoto oil cooler kit is a direct fit for the Subaru Impreza WRX STI from 2008 through 2014, the Subaru Impreza WRX STI Limited from 2011 through 2014, and the Subaru Impreza WRX STI Special Edition for 2010. It also fits the Subaru WRX STI Base and Sport-tech trims from 2013 through 2014, as well as the 2014 Subaru WRX STI Tsurugi Edition. These applications correspond to the EJ257 engine code and GR/GV chassis codes. Note that this kit is designed for 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.
Features
- 19-row oil cooler core mounted in the front bumper for optimal airflow and cooling efficiency
- Bar-and-Plate, Performance-grade Silver core with Anodized finish
- Direct-fit application-specific mounting brackets for hassle-free installation
- Preassembled stainless steel braided lines: a 3ft 6in line with 150-degree -10AN fittings and a 4ft line with 90-degree and 150-degree -10AN fittings
- -10AN Male AN Flare inlet and outlet fittings
- Reduces oil temperatures by 20-30 degrees, including a 20°F (16°C) drop, with minimal pressure loss
- 2ft of thermal reflective wrap to deflect heat from nearby exhaust components
- Retains use of the stock liquid-to-liquid oil cooler unit
- Available with black or silver cooler and an optional M20 thermostatic sandwich plate for added oil temperature control
- Kit includes M20 Stainless Steel Sandwich Plate Adapter, M20 x -10AN straight fittings, and mounting hardware set
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMOC-STI-08T
- Product Type: Cooling
- Core Type: Bar-and-Plate
- Core Row Quantity: 19
- Core Color: Silver
- Grade Type: Performance
- Color: Silver
- Finish: Anodized
- Core Height: 5.43 in
- Core Length: 11 in
- Core Thickness: 1.97 in
- Overall Width: 12 in
- Overall Height: 10 in
- Overall Length: 11 in
- Inlet Fitting Type: AN Flare, Male
- Outlet Fitting Type: AN Flare, Male
- Engine Code: EJ257
- Chassis Codes: GR, GV
- Recommended torque for straight fittings and banjo bolts: 15-25 lb-ft (do not exceed 35 lb-ft)
Frequently Asked Questions
Which vehicles does the Mishimoto MMOC-STI-08T oil cooler kit fit?
It is a direct fit for the Subaru Impreza WRX STI (2008-2014), Subaru Impreza WRX STI Limited (2011-2014), Subaru Impreza WRX STI Special Edition (2010), Subaru WRX STI Base (2013-2014), Subaru WRX STI Sport-tech (2013-2014), and the 2014 Subaru WRX STI Tsurugi Edition.
How much does this kit lower oil temperatures?
Mishimoto states this oil cooler kit reduces oil temperatures by 20 to 30 degrees, including a documented 20°F (16°C) temperature drop, while maintaining minimal pressure loss.
Will this oil cooler kit work with any STI turbo setup?
This kit is designed for models 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 included in the Mishimoto STI oil cooler kit?
The kit includes application-specific mounting brackets, a 19-row oil cooler, a 3ft 6in stainless steel braided hose with 150-degree -10AN fittings, a 4ft stainless steel braided hose with 90-degree and 150-degree -10AN fittings, an M20 thermostatic sandwich plate, an M20 stainless steel sandwich plate adapter, M20 x -10AN straight fittings, 2ft of thermal reflective wrap, a mounting hardware set, and the Mishimoto Lifetime Warranty.
Can I customize the cooler color or add a thermostat?
Yes, the kit is available with either a black or silver cooler and can be configured with an optional M20 thermostatic sandwich plate for greater oil temperature control.
Does this kit replace my STI’s factory oil cooler?
No, this Mishimoto kit retains the use of the vehicle’s stock liquid-to-liquid oil cooler unit.
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.
