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Spring is in the air, check out what new products are blooming!

Radium Air Oil Separator Kit 2015+ Subaru WRX

Radium Air Oil Separator Kit | 2015+ Subaru WRX (20-0258-00)

Regular price $499.95 USD $474.95 USD

Manufacturer: Radium

SKU: rad20-0258-00


The Subaru FA20 engine aren't as prone to have blow-back oil unlike the EJ25 motors. However high power builds can still have this problem, and to prevent any issues we recommend an air oil separator.

Like the Radium Engineering Subaru Dual Catch Can Kit, the AOS (Air Oil Separator) kit is responsible for keeping blow-by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS system returns what is collected back into the oil pan so there is no regular servicing required.

The built-in heater keeps water from condensing in the AOS. And because water is more dense than oil, there is an integrated water trap found around the bottom perimeter of the can. This prevents water from descending into the oil pan if ever present. Furthermore, because the water is trapped against the heater, it will eventually boil and evaporate out of the system. Ergo the "Air Oil Separator" nomenclature.

Mount works with Left-Hand Drive vehicles only, this kit includes RAD.20-0255 which is the Brake Master Cylinder Brace and necessary to properly mount this kit.

Vehicle Applications:
  • Subaru WRX [VAG] (2015, 2016, 2017, 2018, 2019)


Designed to safeguard your motor from engine oil in the intake system
Connects to OE lines to prevent oil in the intake system
Unlike catch can kits this automatically returns oil back into the oil pan
CNC Billet Aluminum for nice appearance
Includes Brake Master Cylinder Brace Mount
Highly recommended for builds pushing high power

Extended Information

Type: Air Oil Separator
Material: Billet Aluminum
Finish: Anodized Black
Engine: FA20
Chassis: VAG
Included Parts: air oil separator body, mounting bracket, (RAD.20-0255)Brake Master Cylinder Brace, all necessary SAE J30R7 rated PCV/Emissions hoses, coolant hoses and fittings, all necessary aluminum fittings and hose-ends, and stainless steel mounting hardware

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Returns Policy

Most items may be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on special order, opened, installed, incomplete, or otherwise used products.

In order to initiate a return, an RMA number must be requested and approved. All returns will be subject to a 15% restocking fee minus complete shipping cost.
For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.