u/Mammoth_15

Hey guys, just bought my first Miata about 3 weeks ago and I love the car 1991 1.6 liter with 178,XXX. Got under it to clean some of the grime and do an oil change the other day
And I saw small hole with threads inside that definitely didn’t look like a normal bolt hole I was wondering if anyone would be able to tell me what’s up with it. The car runs and drives great and has some oil leaks but no fluid is dripping dripping out of the hole.