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Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit

Take your Subaru STi to the next level with the Radium Engineering Air Oil Separator-Return Kit. This innovative system traps blow-by oil before it can be sent back to the induction system, ensuring a cleaner engine and improved performance.

The collected oil is heated by the AOS to remove moisture, then allowed to drain back into the engine block, making this a zero-maintenance system. Installation is a breeze, using factory mounting points and including all required hardware, hoses, and other items.

  • Traps blow-by oil for a cleaner engine and improved performance
  • Heated by the AOS to remove moisture
  • Zero-maintenance system
  • Easy installation using factory mounting points
  • Includes all required hardware, hoses, and other items
Make Model Year Type
Subaru WRX STI 2015 Base
Subaru WRX STI 2015 Launch Edition
Subaru WRX STI 2015 Limited
Subaru WRX STI 2016 Base
Subaru WRX STI 2016 Limited
Subaru WRX STI 2016 Series.HyperBlue
Subaru WRX STI 2017 Base
Subaru WRX STI 2017 Limited
Subaru WRX STI 2018 Base
Subaru WRX STI 2018 Limited
Subaru WRX STI 2018 Type RA
Subaru WRX STI 2019 Base
Subaru WRX STI 2019 Limited
Subaru WRX STI 2020 Base
Subaru WRX STI 2020 Limited
Since 2010, Radium Engineering's goal has been to develop and produce high quality and high performance aftermarket automotive products. All Radium Engineering products are carefully planned, with thorough R&D and designed in-house using the latest computer simulation and modelling techniques. Extensive testing and evaluation ensures that the performance of Radium products exceeds consumer expectations. Currently, Radium offers motorsport parts and accessories for high performance and racing purposes, with a focus on the revolutionary fuel tank line and PCV oil collection systems.
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