BMW 550i xDrive spark plugs fouled due to excessive oil from broken crankcase vent hoses and leaking valve stem seal on BMW 550i xDrive

Some BMW 550i xDrive owners report experiencing issues related to fouled spark plugs due to excessive oil from broken crankcase vent hoses and leaking valve stem seals. Symptoms of this problem can include engine misfires, erratic behavior, and poor ignition of the air-fuel mixture. Common causes of fouled spark plugs noted by owners are oil-contaminated combustion chambers, overheating engines, and leaky head gaskets. Additionally, carbon fouling can lead to significant performance issues if not addressed in a timely manner. Some owners also report that faulty spark plug wires can result in lower fuel economy and decreased acceleration. To maintain smooth engine operation, it is essential for owners to replace worn-out spark plugs and follow proper procedures for removing fouled plugs, including disconnecting the battery. Addressing these issues promptly is crucial for the performance and longevity of the BMW 550i xDrive's engine.