Radium Engineering AOS-R Air Oil Separator Return Kit
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Radium Engineering AOS-R Air Oil Separator Return Kit - Subaru WRX (GR/GV) / WRX STI (VA) / Forester XT (SH)
Heavily modified Subaru engines produce more blow-by than a small catch can can handle. The Radium Engineering AOS-R (Air Oil Separator - Return) kit keeps blow-by oil and contaminants out of the intake pipe, manifold, turbocharger and intercooler at all engine loads, and returns what it collects to the oil pan so there is nothing to empty (SKU 20-0607).
It suits the 2008-2014 Subaru WRX (GR/GV), 2015-2021 WRX STI (VA) and 2009-2013 Forester XT (SH). A built-in heater prevents water condensing inside the separator, and because water is denser than oil an integrated trap around the bottom of the can stops it reaching the sump.
Note: Installation by a professional is recommended.
Features
- Returns separated oil to the sump - no servicing required
- Built-in heater prevents condensation
- Integrated water trap
- Protects intake, turbo, intercooler, throttle body and manifold from oil build-up
Need help confirming fitment? Contact our team at sales@chicaneaustralia.com.au.
Vehicle Compatibility
| Make | Model | Chassis | Years | Engine / Notes |
|---|---|---|---|---|
| Subaru | WRX | GR/GV | 2008-2014 | - |
| Subaru | WRX STI | VA | 2015-2021 | - |
| Subaru | Forester XT | SH | 2009-2013 | - |
Technical Specifications
| Spec | Value |
|---|---|
| Brand | Radium Engineering |
| Type | Air oil separator with oil return (AOS-R) |
| Heater | Built-in |
| Water Trap | Integrated, around base of can |
| Servicing | None required - oil returns to sump |
| Part number(s) | 20-0607 |
No instructions available for this product.

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