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Yeah, I'd want to know what that goo is. Silicone?
I am kinda anal about inspecting parts while disassembling. When I tore down my engine recently, I was noticing the hot spots. The head area around the blanking plug and both push rod holes appear to get much hotter than the rest of the head based on the oil stains. The o ring could be baked and bad. It would take a really strong arm to strip the threads, but possible I guess.
I HATE TO SEE PEOPLE DO THESE THINGS, that said it does not particularly surprise me. Some folks should just not be let anywhere near a wrench.
"Oil? They put oil in at the fact ry, boy. Just top it up when it gets below the low level on the dipstick. "(Advice given to me by the old man..a horse guy.)