Perrin Oil Cooler Kit 2002-2014 WRX / 2004-2021 STI | Integrated Thermostat | High-Efficiency Oil Cooling System
Overview
The Perrin Oil Cooler Kit is a precision-engineered solution designed to reduce engine oil temperatures on Subaru WRX and WRX STI models spanning 2002-2014 for the WRX and 2004-2021 for the STI. This kit helps maintain consistent horsepower by preventing oil overheating during spirited driving or racing conditions. Elevated oil temperatures can degrade engine performance and lubrication quality, so this oil cooler system is essential for enthusiasts looking to protect their investment and sustain peak engine efficiency.
Built around a high-efficiency bar and plate style core, the Perrin Oil Cooler Kit maximizes heat dissipation without compromising oil flow or pressure. The integrated 85°C thermostat ensures oil reaches optimal operating temperature before cooling, promoting engine longevity and performance consistency. Components like the 304 stainless steel mounting brackets and Aeroquip -10 hoses wrapped in heat-resistant Pyrojacket demonstrate Perrin’s commitment to durable, high-quality materials and thoughtful engineering.
For Subaru owners, especially those pushing their WRX or STI hard on track or in demanding conditions, this oil cooler kit offers a tangible performance advantage. Typical setups see oil temperature drops of 15°-20°F at high RPMs, which translates to better lubrication, reduced engine wear, and more reliable power delivery. The kit’s direct-fit design and robust construction make it a practical upgrade for maintaining Subaru’s renowned boxer engine health under stress.
Features & Specifications
This Perrin Performance Oil Cooler Kit is engineered for Subaru WRX and WRX STI platforms and features an integrated 85°C thermostat for optimal oil temperature control. Constructed from 304 stainless steel, 6061 T6 aluminum, and Aeroquip elastomer hoses with Pyrojacket heat shielding, it delivers reliable cooling performance and durability for Subaru enthusiasts seeking enhanced engine protection and consistent power.
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Brand: Perrin Performance
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Product: Perrin Oil Cooler Kit 2002-2014 WRX / 2004-2021 STI
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Part Number: PSP-OIL-110
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Fitment: Subaru WRX (2002-2014), Subaru WRX STI (2004-2021)
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Material: 304 Stainless Steel, 6061 T6 Aluminum, Aeroquip Elastomer Hose
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Finish: Natural metal finish with Pyrojacket hose wrap
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Construction: Bar and plate oil cooler core, integrated thermostat, preassembled hoses
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Origin: USA (Perrin Performance)
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Oil Cooler Core Dimensions: 9.5" x 4.75" x 2.2"
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Core Delta PSI: 3.0/3.5 PSI
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Core BTU/hr Range: 22,000-29,000
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Thermostat Activation Temperature: 85°C (185°F)
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Hose Size: -10 AN
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Hose Construction: AQP Elastomer Tube, Textile Braid Reinforcement, AQP Elastomer Cover with Pyrojacket
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Additional Oil Required: 1 quart
Key Benefits
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Performance: Maintains consistent horsepower by preventing oil overheating during high RPM operation.
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Durability: High-quality materials and construction extend engine life by ensuring optimal oil temperature and lubrication.
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Fitment: Designed specifically for Subaru WRX and STI models with direct bolt-on mounting brackets for seamless installation.
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Thermal Efficiency: Bar and plate core maximizes heat dissipation without restricting oil flow or pressure.
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Reliability: Integrated thermostat ensures oil reaches ideal operating temperature before cooling, protecting engine components.
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Heat Resistance: Aeroquip hoses wrapped in Pyrojacket withstand extreme temperatures, ensuring long-term durability.
What's Included
- 1× Perrin Oil Cooler Core
- 1× Perrin Filter Adapter with Integrated Thermostat
- Preassembled Aeroquip -10 AN Hoses with Pyrojacket Heat Shielding
- 304 Stainless Steel Mounting Brackets
- 6061 T6 Aluminum Oil Spacer
- Installation Instructions
Installation & Compatibility
Installation of the Perrin Oil Cooler Kit is moderately complex and recommended for those with mechanical experience or professional installation. The kit uses existing mounting points on the OEM core support for a clean fit. Special tools for hose fittings and oil system bleeding may be required. Note that 2002-2007 WRX and 2004-2007 STI owners must use the coolant crossover pipe from 2008+ STI models (OEM part number 21328AA140) to ensure proper fitment. This kit requires adding approximately one quart of additional engine oil. No ECU tuning is required, but proper installation and oil system maintenance are essential for optimal performance.
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Professional Installation: Recommended
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Modifications Required: Use of 2008+ STI coolant crossover pipe for early models
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Verify Compatibility: Confirm fitment for your specific year and trim level
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