Moroso 85638 Air Oil Separator Small Body Billet Aluminum PCV

The Moroso 85638 Air Oil Separator is a small-body, billet aluminum unit designed to be plumbed inline with a vehicle's PCV (Positive Crankcase Ventilation) system. It captures excess crankcase vapors and residual oil mist before they can re-enter the intake tract, helping protect engine components and maintain consistent performance.

From the factory, most vehicles recirculate these crankcase vapors and oil mist directly back into the intake manifold. Over time, this can lead to pre-ignition/detonation issues and the buildup of oil deposits on intake valves, manifold walls, and other critical components. The Moroso 85638 eliminates this problem by intercepting and collecting that contaminated vapor before it causes harm.

Key Features:

• Small-body billet aluminum construction — complements any engine bay and can be polished, chromed, or powder coated for a custom appearance
• Inline PCV system integration — captures excess crankcase vapors and oil mist before they re-enter the intake manifold
• Prevents detonation and intake deposits — keeps intake valves and manifold surfaces clean for optimal airflow and combustion
• Bottom drain with elbow fitting — allows virtually mess-free draining of collected oil
• Complete installation kit included — comes with 3/8" 90° inlet and outlet fittings, 60" of 3/8" rubber hose, a billet aluminum body mounting clamp, and a mounting bracket

The Moroso 85638 is an ideal upgrade for performance builds, forced induction applications, and any engine where crankcase pressure management and intake cleanliness are a priority.