Hmmm...can you separate the washer from your plug? It looks as though the edge of your crush washer actually has black paint on it (like the rest of the plug)?
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Yes they come off. It's not easy especially if it's been crushed a lot.
I use the new washer that comes with the oil filter
MIRAGE
Model/Year Engine Oil Filter MSRP
2014-2015 1.2L 3cyl. MZ690072 $6.55
Straight from Mitsubishi MZ690072 is the replacement
https://www.mitsubishicars.com/owner...vsp-oil-filter
I ordered a case of these, and they didn't come with the washers. That's why I had to order them separately. I have seen Mitsubishi filters that both do and do not come with a new oil plug washer. Here is what I bought.
http://www.ebay.com/itm/370102285184...%3AMEBIDX%3AIT
I'm having the same slow drip with my drain plug, never noticed oil on the pavement but I could see a drop of oil hanging there when I went to change it. I just ordered a Fumoto valve now, thanks everyone for all the great advice!