Verus Engineering Air Oil Separator (AOS) - 2022 Subaru BRZ / Toyota GR86OVERVIEW The Verus Engineering Air Oil Separator (AOS) ensures the intake system remains oil free. Oil in the intake system reduces octane, which can lead to detonation, reduction in power, and carbon build up. Four, 5 micron, coalescent filters, one on each inlet and outlet, baffling, and stainless mesh offer unprecedented air filtration for the crankcase air. With optional add ons like our AOS drain back kit and AOS coolant add on kit, our AOS will