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Old 01-07-2020, 02:30 PM   #40
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Join Date: Jan 2008
Location: southern California
Posts: 2,937
My Ride: 2000 323i auto wagon
Ok, maybe this is the real reason why not removing plugs with hot engine: aluminum head expanded more than steel plug threads, length wise. This would cause more friction on the threads and so the removal torque needed to be higher than room temperature.
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