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If it really bothers you, replace the threads now, but it's not a mystery engine. It's been yours for 6 years w/o leakage from that location. Use a fresh gasket and if it leaks after installation and running, a new thread insert can be easily installed. If it doesn't leak, buy us lunch.
If you want to go anal, apply Locktite 574 (or equiv.) on dry threads (a challenge at this location), then allow to set overnight before the refill. There's only atmospheric pressure and gravity behind the oil. I've used that on paper/cardboard/metal washers when I want to ensure a seal against potential leaks.
Sherwood
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