CSF 7042O Radiator w/Oil Cooler for 2008-2021 Subaru WRX/STI Impreza Outback

Vehicle Fitment

• 2008-2014 Subaru WRX (2.0L H4 Turbo)
• 2008-2014 Subaru WRX STI (2.5L H4 Turbo)
• 2015-2021 Subaru WRX (2.0L H4 Turbo; requires turbo return pipe cap off)
• 2015-2021 Subaru WRX STI (2.5L H4 Turbo; requires turbo return pipe cap off)
• 2008-2016 Subaru Impreza (2.5L H4)
• 2005-2009 Subaru Legacy/Outback (2.5L H4)
• 2009-2013 Subaru Forester (2.5L H4)

Features

• High-performance all-aluminum radiator with built-in liquid-to-oil cooler
• 2-row 42 mm core featuring CSF's exclusive B-Tube technology for enhanced heat transfer
• Ultra-efficient multi-louvered fin design maximizes airflow and thermal rejection
• Liquid-to-oil plate-type oil cooler integrated into bottom end tank
• CNC-machined quick-connect inlet/outlet fittings for secure hose connection
• CNC-machined OE-style brackets for durable, accurate fitment
• Drop-in fit requiring no major modifications to OEM mounting points or hoses
• Polished finish with race-style aluminum drain plug and 1.4 bar radiator cap included

Specifications

• Part Number: CSF 7042O
• Core Material: Aluminum
• Tank Material: Aluminum
• Rows: 2
• Core Thickness: ~1.625"
• Core Width: ~27.0"
• Core Height: ~13.38"
• Flow Type: Down-flow radiator
• Inlet Diameter: ~1.5625" (top center)
• Outlet Diameter: ~1.5625" (bottom left)
• Oil Cooler: Built-in liquid-to-oil plate-type
• Radiator Cap: Included (1.4 bar)
• Sold Individually (1x radiator w/oil cooler)

Included Components

• 1x CSF 7042O Radiator (All-Aluminum, 2-Row Core)
• 1x Built-in Plate-Type Oil Cooler
• 1x Polished Aluminum Drain Plug
• 1x CSF 1.4 bar Radiator Cap

Product Description

The CSF 7042O radiator is a **high-performance all-aluminum cooling solution** engineered for Subaru WRX and WRX STI models spanning the 2008-2014 and extended 2015-2021 range (requires minor turbo return pipe modification for later WRX/STI), as well as compatible Impreza, Legacy, Outback, and Forester applications with 4-cylinder engines. It features a **dual-row 42 mm core** built with CSF's proprietary **B-Tube technology** and an integrated liquid-to-oil plate-type cooler in the bottom end tank, designed to help manage both coolant and oil temperatures more effectively than conventional radiators.

Designed as a **true drop-in replacement**, the CSF 7042O installs using the vehicle's original mounting points, brackets, hoses, and fan shroud with no major modifications required. Its ultra-efficient multi-louvered fin design and CNC-machined fittings improve airflow and heat dissipation, helping maintain optimal engine cooling under spirited driving, towing, and performance conditions. The polished finish, included radiator cap, and race-style hardware deliver both function and style for enthusiasts and daily drivers alike.