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Originally Posted by xxMike61
So in the past week or so I've noticed that my engine sounds louder than usual. Not the exhaust or anything related to that but I hear things spinning more I guess. Like the higher RPMs I go the louder it is (duh) but I haven't heard anything like this before. There's almost a rhythmic rock/ knock to it. I've taken logs and looked under the hood and all seems well. I am running Mobil 1 0w40 and I am about 5k into this oil run. Since I am very paranoid I will be changing the oil this week and sending in a sample wish me luck.
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Take it to a BMW specialist, or dealer if you have to, and have them listen to it. They should know right away if something is wrong.