I would recommend using the seafoam spray top engine cleaner before installation of the air/oil separator (aos) this thing works wonders, cleans up all the gunk & buildup
Improve engine performance and longevity by adding a perrin air oil separator to your subaru wrx, sti, legacy gt, or outback xt
Learn how an aos boosts performance and longevity
My 2014 2.5 has a box on the intake hose, left of the throttle body, that traps oil from the lower crankcase breather pipe
It works well since almost no oil residue gets on the throttle plate.
Iag performance air oil separators (aos) for subaru wrx, sti, forester xt and legacy gt
By giving each engine port its own entrance to the aos we have allowed for more effective and faster excavation of crankcase pressure.
An air oil separator makes sense
It’s the kind of upgrade you appreciate 50,000 miles later.
The iag performance v3 street series air / oil separator (aos) is an excellent.
Any oil in the cylinder dilutes the air/fuel mixture and is not helping performance
I have noticed many vehicles coming with oil baffles and devices to limit the oil getting into intake system
Has anyone added an aos to their xt or wilderness
Thoughts on using on as a preventative measure
I understand what they are and how they work just not sure if it’s necessary or.
The protection your subaru deserves
When it comes to protecting your subaru’s heart, nothing beats the crawford air/oil separator —the original aos that started.
Boost engine health with a 1l cast aluminum canister for superior oil separation.
Baja air oil separator aos kits for subaru models at crawford performance
Improve engine reliability & performance—find the perfect fit for your vehicle!