This happened to mine this year I always used to tighten it to the recommended torque setting but have since found out that you shouldn't do this because the thread is always oily which effects the torque setting, which is why most people over tighten them and over time strip the thread.

I have now fitted a special Drain Plug which is a self sealing valve which is supplied with a hose attachment, when you screw on the hose it opens the valve and allows you to drain the oil without any mess and also means no more striped threads.

I managed to do this without removing the sump all I done was tap out the hole one size up to a M16 X1.5 pitch thread, luckily my tap fitted on to a socket wrench which made it easer to turn while pushing and keeping it square I also needed to lower the anti roll bar a small amount via the two bush clamps.

As for the swarf I wouldn't worry to much as most of the swarf will stick to the oily tap then all I done was use plenty of bent cotton buds to fish the remainder of the swarf from around the back of the hole, I then attached a length of hose and a large funnel to the sump where the turbo oil pipe drains back to, and flushed 5 ltr's of cheap thin oil through it just to make sure.

Here's a few pics of it.