RuiP, why don't you just go to a auto-parts store and get an Over-sized Plug? They are cheap, they cut their own threads, and they are re-useable.
For an update, the dealer said my problem is covered under warranty. Luckily! Now they are just waiting to see what the recommended fix is through warranty, which is some what dependent on parts. It's either a Time Sert type fix or a new Crankcase.