Air/Oil Separator Kit - Black/Red

• 2004-2008 Subaru | Forester XT
• 2002–2007 Subaru | WRX
• 2004–2021 Subaru | WRX STI

The most complete and compact Air/Oil Separator on the market.

An Air/Oil Separator has one job: remove the oil from the engine ventilation system so the oil does not get sent through the intake system. The GrimmSpeed Air/Oil Separator for turbocharged Subaru models has a unique design that allows you to maintain your PCV valve while separating the oil out of the crankcase and head ventilation air, so your engine can run more efficiently. Oil in the intake system results in:

• Reduced fuel octane
• Higher chance of engine knock (detonation)
• Worse emissions
• Higher oil consumption

No more checking and emptying a catch can and refilling your oil. The GrimmSpeed AOS coalesces oil without using a mesh media, which can collect contaminants and build up into possible sludge. The AOS is self-maintained.

Please note : this product is designed to combat factory amounts of blow-by. If you have a built motor or are experiencing abnormal amounts of oil consumption, this product may not work for you.

Quick Specs

• Maintenance-free design: no more draining your catch can
• Fully machined billet aluminum construction
• Durable black or red anodized finish
• User-replaceable O-ring seals

Finishes on this listing

• Black (grm078006)
• Red (grm078006R)

Fitment

• 2004-2021 Subaru STI
• 2002-2007 Subaru WRX
• 2004-2008 Subaru Forester XT
• 2004-2006 Subaru Baja XT

Q: Which vehicles does 078006 fit?
A: This product fits the 2004-2021 STI, 2002-2007 WRX, 2004-2008 Forester XT and 2004-2006 Baja XT.

Q: Do I keep my PCV valve?
A: Yes. The design lets you maintain your PCV valve.

Q: Does it need to be drained like a catch can?
A: No. It uses a maintenance-free, self-maintained design.

Q: Will it work on a built motor?
A: It is designed for factory amounts of blow-by; It may not work on built motors or engines with abnormal oil consumption.

Review our Shipping Policy for delivery details, shipping costs and exclusions.

Eligibility, exclusions, applicable fees and exceptions are detailed in our Return Policy. Restrictions apply to special-order and custom products.

Proposition 65 Warnings: cancer and reproductive harm www.p65warnings.ca.gov