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Discussion Starter #1
What is the purpose of this?
My X never had one on its oil drain plug.
 

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I believe hit helps make the seal. The copper washer is soft and will 'mold' to the pan and bolt as you are tightening.
 

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I bet it has it. Once it's crushed down and dirty, it just looks like a normal washer or it may even just look like part of the head of the bolt. Take a close look at the bolt when it's removed.
 
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