Nothing of concern as far as it being a problem. It’s just an annoyance likely caused by seepage through the threads on the stud into the valve cover. If you’d like to fix it the stud would probably have to be removed and sealant sparingly applied to the threads.

Do double check that hose next to the stud/nut for porosity.

Leave it alone unless it bothers you.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer