Basically, a catch can does exactly what it sounds like – it catches things. Specifically, it catches the oil mist and blow – by gases that get past your piston rings. Now, your engine isn’t perfect, and some of those gases – a mix of oil vapor, fuel, and combustion byproducts – slip past the piston rings into your intake system. The catch can intercepts this stuff before it gets recirculated back into the engine. It separates the liquids from the gases, and the liquid oil collects in the can. You drain it periodically, just like your oil. Think of it as a little filtration system for your intake. Normally, those blow – by gases go straight into the intake manifold, and then get burned along with the air/fuel mixture. The catch can sits in line with the PCV system – that’s the Positive Crankcase Ventilation system, which is how the engine breathes. It intercepts those gases before they get to the intake. The clean air then gets recirculated. It's a little extra step to keep everything running smoothly. Well, those gases aren’t exactly good for your engine’s performance. They can cause carbon buildup on valves and reduce octane, which messes with timing. Over time, that can lead to reduced horsepower and fuel economy. It also helps protect your turbocharger if you have one – that oil mist isn’t doing it any favors. The catch can acts like a shield, preventing that stuff from building up and causing problems down the road. You’ll notice if you skip maintenance on one, eventually. Performance will start to suffer, and you might even get a check engine light. You can find a good selection of catch cans, including ones for your vehicle, over at Fixparts Online, if you're looking. They're not essential on every car right off the bat, but they’re a smart preventative measure, especially if you're pushing your engine a little harder, or if you’ve got a higher mileage vehicle. Better than the rest: Catch Can (MPN 8V3807740) includes a 12-month warranty!

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• Audi parts are made specifically for your vehicle, ensuring a perfect fit and optimal performance. • Using genuine Audi parts helps maintain your vehicle's value and original quality. • Audi parts are rigorously tested to meet high safety and durability standards, giving you peace of mind. • You’ll get reliable performance and keep your Audi running like new with parts designed by the original manufacturer. Audi – trusted quality, available at FixParts Online!