Radium Air/Oil Separator Kit | 15-21 Subaru WRX / 14-18 FXT (20-0258-00/1) Radium Engineering

15-21 WRX & 14-18 FXT Air/Oil Separator Kit by Radium

High-powered modified Subaru engines tend to generate excessive blow-by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. 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 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.

The Radium Engineering AOS kit installs on the LH side of the engine bay, near the brake master cylinder. The outlet (side port) of the AOS is plumbed back to the turbo inlet pipe, creating a completely sealed system. The AOS mounts to the Radium Brake Master Cylinder Brace. This brace is REQUIRED for installation. The PCV valve is replaced by a custom machined straight-through adapter fitting. Oil collected in the AOS drains out the bottom fitting and back into the engine block through this fitting.

Features

• Machined aluminum Radium Engineering Air/Oil Separator
• Specially designed mounting bracket
• All necessary SAE J30R7 rated PCV/Emissions hose
• Coolant hoses and fittings
• PCV delete fitting
• All necessary aluminum fittings and hose-ends
• Stainless steel mounting hardware

Please Note: The AOS mounts to the Radium Brake Master Cylinder Brace (20-0255). This brace is REQUIRED for installation.

Applications

• 2015 – 2021 Subaru WRX
• 2014 – 2018 Subaru Forester XT

Specifications

• AOS Height: 6.94″
• AOS Diameter: 3.45″
• AOS Capacity: 20.3 oz (600mL)

What’s In The Box?

• 1 – Radium Air/Oil Separator
• 1 – Master Cylinder Brace (optional)
• Hoses and Fittings
• Mounting Brackets and Hardware

References

• Installation Instructions

Warranty

• Manufacturer Standard Warranty