The reason I asked if it was smoking is because if you noticed the car "missing" on the e-way at 65 then it was probably something different.
The oil on the thread of #4 is certainly a spill or a valve cover gasket. Unless the entire plug was covered.
You probably take care of your ride, but the big deal with the oil up top has always been a dirty pcv. And almost everyone that ends up with a problem never drained the front sump in the oil pan regularly. Is your pcv cool?
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