driftrider,

Remember these 2 products; PB Blaster and High Temp Anti Seize

PB Blaster is the best thing goin with respect to frozen parts. You' ll see a can on top of many a mechanics tool box. If PB Blaster and some very light heat won' t free it up it ain' t comin loose!

To prevent the plug from freezin up in the 1st place Try This - For years I have used High Temp Anti Seize paste (used around auto shops). Brush the stuff on threads,screw plug in and it should never freeze up again. I' ve never had a problem after using the stuff on threads.

Good Luck