Engines and Components› Oiling Systems

IAG

Air Oil Separator

$499.99

SKU: IAG-ENG-7186

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The IAG Performance V3 Street Series Air/Oil Separator (AOS) is a critical upgrade for your Subaru, offering unparalleled engine protection. This AOS features a 1-liter cast aluminum swirl pot canister designed to significantly enhance oil separation from the PCV system. Its exclusive baffle design and superior ventilation differentiate it from other products on the market. The IAG AOS optimizes crankcase ventilation, works with all fuel types, and seamlessly integrates with standard ECU settings, requiring no tuning.
Show original supplier description
This system employs a unique baffle design within its cast aluminum body, topped with nylon, to effectively separate oil from the crankcase ventilation system. Available in black, red, or neon yellow, it offers a customizable look for your engine bay. Designed for specific Subaru models, this AOS kit is compatible with 2008-2014 WRX, 2008-2021 STI, 2005-2009 Legacy GT, 2009-2013 Forester XT, and 2018-2021 Impreza models, all featuring the EJ 2.5L Turbo engine.
Vehicle Symptoms
  • Blue smoke from exhaust on startup
  • Excessive oil consumption between changes
  • Rough idle or hesitation at low RPM
  • Check engine light with misfire codes
  • Loss of power under boost or acceleration
Diagnostic Codes
  • P0300 – Random or multiple cylinder misfire Det
  • P0301 – Cylinder 1 misfire Det
  • P0302 – Cylinder 2 misfire Det
  • P0303 – Cylinder 3 misfire Det
  • P0304 – Cylinder 4 misfire Det
Relevant Conversations
  • Subaru oil in intake fix
  • IAG V3 AOS install review
  • P0300 rough idle Subaru
  • Best air oil separator for WRX STI
  • IAG AOS vs Crawford AOS
  • How to install IAG AOS on Subaru
  • Subaru blue smoke on startup
  • Oil separator causing idle issues?
  • IAG AOS group buy
  • Subaru detonation prevention AOS

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandIAG
Part NumberIAG-ENG-7186
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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