The function of the BMW 428i xDrive Valve Stem Oil Seal is to prevent engine oil from entering the combustion chamber. In other words, it allows the engine to take in clean air without burning oil. As a result, the motor is able to deliver maximum power. The Valve Stem Oil Seal applies a thin layer of oil on each of the valve stems that is transferred to the guides while blocking excess oil to protect the 428i xDrive intake as well as exhaust and preventing harmful deposits from stealing horsepower. BMW has engineered this little part with heat resistant rubber fluoroelastomer blend material, whose effectiveness has shown through in thousands of miles of spirited 428i xDrive touring. Moreover, it is the same Valve Stem Oil Seal part fitted to every BMW coupe, Gran Coupe and convertible variant from multiple production years, so no guesswork at replacement time. A new Valve Stem Oil Seal makes for crisp throttle response, steady idle and strong emissions scores. This means better fuel figures and fewer warning lights on your 428i xDrive day-to-day. In addition to efficiency, the part enhances safety by limiting the chances of valve float which can cause a sudden power drop or internal damage at high rpm so that BMW enthusiasts can push their cars without issue. The light design adds no measurable weight yet withstands seat pressures near ninety pounds, a feat that speaks to why this Valve Stem Oil Seal has earned a solid reputation for durability in the automotive parts market. Under the cold start conditions in winter and on-track sessions in summer, it does not lose its flexibility and prevents oil from leaking past the seal which can cause a smoky exhaust or fouled plugs, and it also protects the turbocharged 428i xDrive engine during redline bursts. When signs of wear begin to show, a timely substitution with a genuine BMW Valve Stem Oil Seal will restore the smoothness expected of a factory-new BMW and maintain the finely balanced performance profile that makes every 428i xDrive feel brand new.
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