PCV Valve Oil Trap Kit

What Is a PCV Valve Oil Trap Kit?

A PCV (Positive Crankcase Ventilation) valve oil trap kit is a critical component of your engine's crankcase ventilation system. As an engine runs, combustion gases — known as blowby — inevitably seep past the piston rings and into the crankcase. The PCV system is designed to route these gases back into the intake manifold to be burned off rather than vented into the atmosphere. However, those gases carry fine oil mist and aerosols with them, and without an oil trap, that contamination ends up coating your intake valves, throttle body, and intercooler — robbing your engine of efficiency and potentially causing long-term damage.

A PCV valve oil trap kit adds a dedicated oil separator or catch canister into the crankcase ventilation circuit. It intercepts the oily blowby gases, lets the oil droplets condense and collect in a reservoir, and then allows only clean air to continue into the intake system. The result is a cleaner intake tract, reduced carbon buildup on intake valves (a particularly common problem on direct-injection engines), and better-preserved performance over time.

Why Does It Matter?

Modern engines — especially high-performance, turbocharged, or direct-injection motors — are particularly susceptible to oil contamination in the intake. Unlike port-injected engines, which wash fuel over the intake valves with every cycle, direct-injection engines have no such self-cleaning mechanism. Over time, oil-laden blowby gases bake onto intake valve stems and seats, causing rough idle, misfires, and reduced airflow. Installing a PCV valve oil trap kit is one of the most effective preventive maintenance steps an enthusiast or daily driver can take to avoid these problems.

Even on naturally aspirated engines, an oil trap protects the mass airflow sensor, throttle body, and other sensitive intake components from oil film buildup. For turbocharged applications, keeping oil out of the charge air path also protects intercooler efficiency and reduces the risk of compressor wheel contamination.

What to Look for When Shopping

• Compatibility: Make sure the kit is designed for your specific engine or intake configuration. Hose barb sizes and port fittings vary widely between applications.
• Trap capacity: Higher-performance or high-mileage engines produce more blowby and benefit from a larger collection reservoir.
• Materials: Aluminum-bodied traps offer durability and heat resistance, while clear or translucent bowls make it easy to monitor fluid accumulation.
• Drain style: Some kits feature auto-drain valves that return collected oil to the sump; others require periodic manual draining.
• Complete kits vs. standalone traps: Full kits typically include all necessary hoses, clamps, and fittings for a clean, leak-free installation.

Top Brands in PCV Valve Oil Trap Kits

HPS Performance Products is a well-regarded name in the performance and import tuning community, known for manufacturing high-quality silicone hoses, intake systems, and ancillary engine components. Their PCV valve oil trap kits are engineered with attention to fitment and durability, making them a go-to choice for enthusiasts looking to upgrade their crankcase ventilation system with a reliable, performance-oriented solution.