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The crush washer is made of soft metal so you don't do damage to the threads in the pan requiring really expensive removal and rework. My bet is the over torquing is an indication that the last oil change didn't use it and so had to over tighten the plug. I always used a new one and ordered them by the bunch.
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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