If you aren't in a hurry to do it just clean up below them and monitor for a little while. You could also pull a few plugs (it's really easy) and see if the leak is on the inside of the tube and how much. My 2000 'S' had 53k miles on it when I got it, plugs had been changed once, I changed them for the heck of it and noticed a very light oozing on the engine which I just cleaned up and have monitored...never was enough it appears to drip. Only one plug had three drops of oil on the inside. I'll change the tubes eventually, but right now the oozing is so very very little and only on a couple since I changed them 1500 miles ago.
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