Well I've been patient for about a week now - heating the thing up and applying penetrating oil and it is still stuck like a stuck thing...

I've been using a plumbing soldering (butane) torch as I have nothing else. Do I need to get a propane torch? With this Butane torch I can get the nut to smoke and the penetrating oil to fizzle but I can't get it red hot.

How hot must it get?