Did you notice that washer was deformed and got new edges after it was tighten at previous oil change?
That's because it made from soft metal (or alloy).
When I changed oil by myself, I noticed that old oil did not come out until the most last turn of the plug. It has a good length insuring no oil leaks even without this washer I think. But anyway, just change it as replacement instruction said, wanna save $1 on this? :-)
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