Radium Engineering AOS-R Air Oil Separator-Return Kit for Subaru WRX 2008-2014 / STI 2015-2021 / Forester XT 2009-2013

Radium AOS-R Air Oil Separator-Return Kit, Subaru WRX (2008-2014) / STI (2015-2021) / Forester XT (2009-2013)

Application: Subaru Impreza WRX / WRX STI 2002–2014, WRX STI 2015–2021, Forester XT 2004–2013, Saab 9-2X 2005–2006 – LHD only
Part Type: Air Oil Separator-Return (AOS-R) kit
Part Number: 20-0607

High-powered, modified Subaru engines generate excessive blow-by oil and gases that can quickly overwhelm a small catch can. The Radium 20-0607 AOS-R (Air Oil Separator-Return) kit keeps blow-by oil and other pollutants out of the intake pipe, intake manifold, turbocharger and intercooler at all engine loads – and unlike a standard catch can, it returns what it collects to the oil pan, so no emptying or servicing is required.

A built-in coolant heater stops water condensing inside the separator, and because water is denser than oil, an integrated water trap around the bottom perimeter of the can keeps water from descending into the oil pan. Keeping oil out of the intake effectively raises octane, can improve performance with cleaner inlet air and lowers hydrocarbon emissions.

Key Features

• Oil Return: Collected oil returns to the oil pan – no emptying or servicing required
• Built-In Heater: Coolant-heated to stop water condensing in the separator
• Water Trap: Integrated trap around the bottom perimeter keeps water out of the oil pan
• All-Load Protection: Keeps oil out of the intake, turbocharger and intercooler at all engine loads
• 600ml Capacity: 160mm tall, 87.6mm diameter separator with 10AN ORB ports

What's Included

• Machined aluminium Radium air oil separator
• Subaru-specific mounting bracket
• SAE J30R7-rated PCV/emissions hose
• Coolant hoses and fittings
• Aluminium fittings and hose ends
• Stainless steel mounting hardware

Optional Parts

• Radium Cruise Control Relocation Bracket - Subaru Impreza/Forester 01-05 (13-0110) – required on 2002–2005 models with a cable-actuated throttle body

Important Notes

• NOT compatible with right-hand drive (RHD) vehicles – for RHD, Radium recommends its Universal AOS-R with custom mounting and plumbing
• 2002–2005 models with a cable-actuated throttle body require Radium's cruise control relocation bracket (13-0110)
• In freezing conditions, insulation sleeving (not included) is recommended over hoses exposed to cold airflow so condensed water can't freeze and block them
• May not be compatible with all other aftermarket products
• Installation instructions are available in the Instructions tab

Vehicle Fitment

• Subaru Impreza WRX 2002–2007
• Subaru Impreza WRX STI 2002–2007
• Subaru Forester XT 2004–2008
• Saab 9-2X / Aero 2005–2006
• Subaru Forester XT 2009–2013
• Subaru Impreza WRX 2008–2014
• Subaru Impreza WRX STI 2008–2014
• Subaru WRX STI 2015–2021
• Left-hand drive only – not compatible with RHD

If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.

Installation

We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.

Note

Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.