IAG AIR / Oil Separator (AOS) - 2020-2025 Subaru Outback XT / Wilderness

Heavy-Duty Engine Defense for Your Turbocharged Outback
Under heavy load, whether towing, overlanding through mountain passes, or pushing your 2.4L FA24 turbo engine on the highway, crankcase pressure forces oil mist and blow-by vapors directly into your intake tract. Once inside, this oil coats the walls of your top-mount intercooler, drastically reducing its cooling efficiency and heat dissipation. Worse yet, when that oil enters the combustion chamber, it dilutes your fuel, lowers effective octane, and induces dangerous engine knock. The IAG V3 Air Oil Separator (AOS) is engineered specifically to catch and separate oil mist before it ever reaches your intake, preserving your engine’s power, intercooler efficiency, and long-term reliability.

Patent-Pending Swirl-Pot Design with Integrated Heating
Unlike basic catch cans that use simple mesh baffles and require constant manual draining, the IAG V3 AOS is a permanent, maintenance-free system. Its high-volume cast aluminum body uses a multi-stage swirl pot layout to spin oil out of the crankcase air stream using centrifugal force. The separated oil then drains safely back into your oil pan. To prevent cold-weather moisture buildup and the dreaded "milky sludge" common in winter climates, IAG routes engine coolant directly through the base of the separator body. This keeps the unit at engine operating temperature, completely eliminating condensation and freezing risks during cold-weather trips.

• Stop Oil Contamination in Intake & Intercooler: Keep oil mist out of your intake, keeping intercooler cores clean and operating at maximum thermal efficiency.
• Prevent Engine Knock & Detonation: Stop crankcase oil vapors from entering the combustion chamber where they lower effective fuel octane and trigger knock retard.
• Heated Housing Technology: Taps into your factory cooling system to keep the AOS warm, preventing water condensation, sludge buildup, and freezing in cold climates.
• Maintenance-Free Drain-Back System: Automatically returns captured oil directly to the oil pan. No messy catch cans to manually drain at every gas fill-up.
• Chassis-Specific Outback XT / Wilderness Fitment: Features vehicle-specific mounting brackets, custom-molded hoses, and quick-connect fittings designed exclusively for the 2020-2025 Outback XT and 2022-2025 Outback Wilderness engine bay.

Technical Specifications:

• Product Type: Air Oil Separator (AOS)
• Housing Material: Heavy-Duty Cast Aluminum
• Separation Method: Multi-Stage Swirl Pot & Baffling
• Thermal Control: Integrated Coolant Passage (Heated Base)
• Drain-Back Style: Automatic Gravity Drain to Engine Oil Pan
• Hose Construction: Custom Molded SAE-Rated PCV & Breather Hoses
• Engine Compatibility: 2.4L Turbo FA24DIT Boxer Engine
• Maintenance Requirement: Zero (Self-Draining System)

Fitment:

• Subaru Outback XT: 2020, 2021, 2022, 2023, 2024, 2025 (2.4L Turbo FA24)
  • Compatible with all XT trims: Onyx Edition XT, Limited XT, and Touring XT.
• Subaru Outback Wilderness: 2022, 2023, 2024, 2025 (2.4L Turbo FA24)

The Nameless "Installation" Pro-Tips:

Coolant Bleeding & Hose Slope Are Everything:

1. Overlanding & Cold-Weather Prep: If you use your Outback XT or Wilderness for winter trips, camping, or off-grid adventures, double-check your coolant hose connections during install. Tapping into the factory heater lines ensures the AOS body warms up as quickly as the engine, preventing frost from forming in the breather ports during freezing morning cold starts.

2. Keep the Drain Line Sloped: When routing the bottom oil return hose back to the crankcase port, make sure it flows on a continuous downward incline without any low-hanging "S" curves. Liquid oil relies entirely on gravity to drain back into the pan—a sagging line will hold oil and back up the separator body over time.

3. Burp the Cooling System: Because this kit taps into your factory heater lines to warm the AOS body, you will introduce air pockets into the cooling system during install. Always fill and thoroughly burp your cooling system using a no-spill coolant funnel after installation. Trapped air in the FA24 cooling system can cause erratic idle temps or improper heater core operation!