Verus Engineering Air Oil Separator 2015-2021 STI

DESCRIPTION

Protect your 2015–2021 Subaru STI engine with the Verus Engineering Air Oil Separator, designed to keep oil out of the intake system and maintain consistent engine performance. Oil vapor entering the intake can reduce effective octane, increase the risk of detonation, and contribute to carbon buildup. This AOS addresses those issues by efficiently separating oil from crankcase air before it can enter the intake tract.

Engineered to install like an OE component, the Verus AOS requires no tuning changes and integrates seamlessly into the factory setup. It filters both the crankcase vent and intake vent locations through a single, compact unit. Internally, four 5-micron coalescent filters, internal baffling, and stainless mesh work together to provide exceptional oil vapor separation. An optional coolant hookup kit is available to circulate warm coolant through the unit, helping reduce condensation buildup in colder climates.

WHY?

The Verus Engineering Air Oil Separator is purpose-built to do one thing exceptionally well: remove oil from the crankcase ventilation system before it reaches the intake. By maintaining a cleaner intake charge, it helps preserve octane, reduce carbon buildup, and support consistent power output. CNC-machined from 6061-T6 aluminum and finished with a corrosion-resistant anodized coating, this AOS delivers long-term reliability with OE-level fitment for street or track-driven STI builds.

FEATURES:

• Prevents oil vapor from entering the intake system

• Four 5-micron coalescent filters for fine oil separation

• Stainless mesh and internal baffling for enhanced vapor condensation

• CNC-machined 6061-T6 aluminum construction

• Anodized finish with laser-engraved branding

COMPATIBILITY

2015-2021 STI