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Old 01-07-2020, 12:22 AM   #14
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Join Date: Jan 2008
Location: southern California
Posts: 2,937
My Ride: 2000 323i auto wagon
Removing plug with hot engine could strip the softer hotter threads. Cold head has stronger threads.

Old plugs might have the protruding threads covered with burned oil and hard carbon; hence it broke loose then jammed by the mentioned dirty threads.

Go slow easy back/forth with lube oil, and best of luck.
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