Quote:
Originally Posted by X5chemist
Wow, that's loud. Do you have a mechanic stethoscope? Brake booster, vacuum reservoir, or oil separator valve. Remove the oil cap at idle. Does it have a large vacuum suction on it?
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Yep, definitely some strong suction. Is that normal? It's an M54.
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2001 E53 M54 5MT Oxford green over crusty black leather 206,000mi
2002 E46 M54 2.5 5MT silver over black sensatec 217,000mi