Searched for the oldest threads with at least one reply, looks like the first one was April of 2004.

First Thread I could find: https://www.okctalk.com/showthread.php?t=5&highlight=

Interesting one about ownership: https://www.okctalk.com/showthread.php?t=57&highlight=

Search for oldest threads: https://www.okctalk.com/search.php?s...d=11247793&pp=

Also of note, HOTROD & BG918 have Midtowner beat by a few months (7/2004) LOL.