This little guy’s job is pretty simple, really. It prevents fluids – usually engine oil, sometimes coolant – from leaking out where a rotating shaft comes out of a stationary part of the engine. Think of it as a barrier, keeping everything contained. It’s a pretty static part, doesn’t really do anything except hold things in, but it’s vital that it does that well. You’ll find these all over the engine, but typically around the crankshaft – that's the main rotating part. They’re also used on camshafts, and sometimes even on the transmission output shaft. Basically, anywhere a shaft spins and needs to be sealed against leakage, that's where you'll find one of these. It’s a small part, but it plays a big role in keeping everything lubricated and running smoothly. You’ll notice if one of these goes bad – usually by a pretty noticeable oil leak. That leak can get worse over time and lead to bigger problems, like low oil levels which can seriously damage your engine. It's a relatively inexpensive part to replace, and doing it proactively can save you a lot of headache and money down the road. They can get brittle and crack over time, or the rubber part can just wear out. It’s a common maintenance item, and a lot of folks order them from places like Fixparts Online because they have a good selection. They really act like a shield, preventing a small issue from becoming a major repair. Professional-grade support: Shaft Seal (MPN 11117547842) comes with a 12-month warranty!

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• Get parts made exactly for your BMW, so they fit and work perfectly. • BMW parts are designed to last, keeping your car running smoothly for years. • Using genuine BMW parts helps maintain your car's value. • You can trust the quality and performance of parts made by the same people who built your BMW. Performance you can rely on – BMW parts from FixParts Online.