These are basically precision – made, cylindrical liners that fit inside the engine block. They create the actual surface the piston rings slide against. Think of it like the inner wall of the cylinder. Sometimes they’re called cylinder liners too, same thing. They aren’t just a simple metal tube, though. They’re designed to handle extreme heat and pressure, and they’re made from materials that can withstand a lot of friction. They’re a core part of what makes your engine run. The pistons move up and down inside these sleeves, and that’s what creates the power. The sleeve keeps everything sealed up, so you get good compression and efficient combustion. When an engine is built, these are pressed or shrunk – fit into the engine block. They effectively create the combustion chamber’s wall. If a sleeve gets damaged—worn, cracked, or scored—you lose compression. That leads to all sorts of problems: reduced power, rough idling, increased oil consumption, and even engine failure. It acts like a shield, protecting the engine block itself from the intense heat and wear. You’ll notice if one goes bad because the engine will start running really poorly, maybe even start knocking. Replacing them is a big job, usually meaning the engine needs to come apart, but it's far cheaper than replacing the whole engine. You can find quality sleeves—and just about any other engine part, really—over at Fixparts Online if you’re looking for a reliable source. They’re a critical component for keeping everything running smoothly and preventing major issues down the road. We’ve got your back: Sleeve (MPN 070103139) is covered for 12 months!

About Audi

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Why Choose Audi?

• 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. FixParts Online – Your Trusted Source for Quality Audi Auto Parts.