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      05-06-2018, 10:03 PM   #8
Sea-Tac
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Drives: 2108 X3 xDrive30i
Join Date: Apr 2018
Location: Bellevue, Wa

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If it smoothes out at speed and you only notice it at start up, I think it might be motor mount left side engine rear. Someone in another post in an X3 forum said that was fairly common.
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