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Old 12-24-2025, 03:26 PM
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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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Old 12-25-2025, 02:53 AM
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Originally Posted by X5chemist View Post
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?
I'll check that, thanks.
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Old 12-27-2025, 05:48 PM
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Quote:
Originally Posted by X5chemist View Post
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?
Yep, definitely some strong suction. Is that normal? It's an M54.
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