From the looks of the oil on that plug, your plug tubes are leaking.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
That is an affirmative ... I was debating with myself on whether to buy a puller or just use a makeshift long bolt head to remove them and replace with the new ones that arrived this week. I can always stock my toolbox, but as I get older and hopefully a little wiser ... I've learned to adapt with what I have on hand. I am sure they are the original and unfortunately, o-rings don't last forever. Could be a little or a lot stuck though. Had any issues removing these?