BMW Engine Valve Stem Oil Seal - Genuine BMW 11340038720

Product Information

A valve stem seal is a small rubber and plastic seal located at the top of the valve stem in an internal combustion engine. Its primary function is to prevent engine oil from leaking into the combustion chamber while allowing the valve to operate freely. The seal creates a barrier between the valve guide and the valve stem, controlling oil flow and ensuring that the engine operates efficiently without excessive oil consumption or emissions.

• Blue Smoke from the Exhaust: When oil enters the combustion chamber due to faulty valve stem seals, it burns along with the fuel, producing blue smoke from the exhaust. This is particularly noticeable during acceleration or after the vehicle has been idling for a while
• Oil Consumption: One of the most noticeable symptoms of failing valve stem seals is increased oil consumption. If the seals are damaged or worn, they may allow oil to seep into the combustion chamber, leading to higher-than-normal oil usage
• Rough Idle: Worn valve stem seals can lead to uneven oil distribution in the combustion chamber, causing rough idling or misfiring as the air-fuel mixture is disrupted

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.