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Originally Posted by Nipperiley
The copper drain plug washer is the most important NOT to reuse. I hate oil leaks. You can sand down the old washer and perhaps reuse it, but just get a new one (which will come with some MBZ filters).
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You're being paranoid. I've reused copper crush washers dozens of times with no leaks, and that's sealing gasoline on a Bosch K-Jetronic system in a Saab, running at 40 PSI rather than less than one, as in your oil drain plug. If they do leak, sandpaper is not the answer, as you can leave the sides other than parallel. The trick is to anneal the washer if it leaks and you don't have a replacement.