Quote
nsjuice,

The drain plug might be a bit quirky, meaning easy to strip. The first time you try to remove it, it might already feel cross threaded. Even if it doesn't, it's best to go slow. The first time you remove it: For every 1/4 turn of the wrench counter clockwise, turn it back in the same amount until it's removed. Get yourself a crushwasher for the last fill.


Amen to that!!!. If you are going to do that much draining all at once you might try the "home flush" method:

Flush

1997 T-100 4X4 Xcab,Warn Hubs
02 Camry LE
2008 Yaris