This little piece is where the valve actually seals against the cylinder head. Think of it like the rim of a glass meeting a coaster—it creates that tight seal. It's machined to a very precise angle, and that’s super important for how well the valve closes. It's what allows the engine to build compression, which ultimately makes power. Different engines use different types – some are swirled, some are stepped, and materials vary too – but they all do that basic sealing job. It’s a critical part inside the engine, specifically within the cylinder head. Every time the engine fires, the valves are opening and closing, and the valve seat is taking a beating. It’s part of the whole combustion process – air and fuel come in, get ignited, and exhaust goes out. Without a good valve seal, that process just doesn’t happen efficiently. It's a pretty small part, but it's working constantly whenever the engine is running. Honestly, it’s hugely important. If a valve seat gets worn, damaged, or burned, you'll lose compression. You’ll notice if it’s bad – things like rough idling, a loss of power, or even the engine misfiring. It can also cause increased emissions. A bad valve seat can eventually lead to more serious engine damage if left unchecked. They’re typically replaced when you’re doing a valve job or a head rebuild, but sometimes you’ll replace just the seats if they’re the only thing damaged. You can find them on sites like Fixparts Online, and there’s a lot of variation based on your specific engine, so getting the right one is key. Customer support you can rely on: Valve Seat (MPN 11120621112) has a 12-month warranty!

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• Get parts made specifically for your BMW, ensuring a perfect fit and optimal performance. • BMW parts are engineered to last, meaning fewer repairs and more time on the road. • Using genuine BMW parts helps maintain your vehicle’s value. • You’ll get the same quality and reliability that BMW is known for, giving you peace of mind. BMW delivers excellence, FixParts Online delivers to your door.