Oil Catch Cans

An oil catch can is an aftermarket part installed in some cars, typically those with performance engines or driven particularly hard. They are not typically included from the factory.

Here's how an oil catch can works:

• Internal combustion engines are not perfect, and some combustion gases leak past the piston rings into the crankcase. This is called blow-by.
• A ventilation system called the positive crankcase ventilation (PCV) valve helps manage this pressure by routing those gases back into the engine's intake system to be burned.
• However, this blow-by also includes some oil mist and contaminants. An oil catch can is installed inline with the PCV system to capture this oil mist and contaminants before they can re-enter the engine's intake.

The benefits of using an oil catch can are debated. Here are some potential benefits:

• Reduced intake buildup: By capturing oil mist and contaminants, an oil catch can can help to prevent buildup on the intake valves and in the intake manifold. This can potentially improve engine performance and efficiency.
• Protected turbochargers: In turbocharged engines, oil buildup in the intake system can coat the turbocharger blades, reducing efficiency. An oil catch can can help to prevent this.

However, there are also some potential drawbacks to consider:

• Not universally beneficial: Not all engines see significant power gains or efficiency improvements from using an oil catch can.
• Maintenance required: Oil catch cans need to be drained periodically, as they will fill up with oil.
• Potential warranty issues: Installing an oil catch can may void your car's warranty, so it's important to check with your manufacturer's recommendations.

Overall, oil catch cans are a niche product that may benefit some specific engines or driving styles, but they are not a guaranteed performance booster and may require additional maintenance.