The worm gear is fine. The spring was strong and the pressure would cause the gear to squeeze out the grease. In the new fix the inject a TON of new grease and a revised spring. Should be fine.
IIRC there are no special additives in the original Honda oil fill. It’s just got higher moly content because of the assembling lubricants. Honda hasn’t said anything about keeping “break-in” oil for any period of time or mileage.
The oil filter and oil pickup mesh should stop any contamination...
Don't stress then. The car has a loud exhaust versus normal Hondas on cold start. My FK8 was quieter but still on the louder side and would vibrate and reflect off everything in the winter.
There are different kinds of misfires and counters the ECU records. Some reset on engine start IIRC. If...