Collection: Crawford Performance Subaru Air Oil Separators

Crawford Performance Subaru Air Oil Separators

The Original. The Proven. 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 a revolution in Subaru engine longevity. Engineered, track-tested, and race-proven, our AOS units are trusted by enthusiasts, tuners, and professional drivers worldwide.

Why Crawford?

✔️ Eliminates Oil Blow-By: Keeps your intake and intercooler free from oil contamination
✔️ Preserves Performance: Prevents detonation and extends engine life under high boost
✔️ Zero Maintenance: Closed-loop design means no emptying, ever
✔️ Track-Tested Reliability: Designed during the original Gymkhana builds for Ken Block — see how it supports FA20 engine reliability in our full mod guide
✔️ Bolt-On Simplicity: Direct fitment for WRX, STI, Forester XT, and more — pairs perfectly with built Subaru short blocks for a complete engine protection solution

From daily street builds to high-horsepower track weapons, Crawford’s Air/Oil Separator is the gold standard in engine protection. Don’t risk your motor with cheap imitations—run the original. Run Crawford.

Shop Now. Protect Your Build.