[rpmerf]

There is a big difference between a cheap propane torch head and a good one. MAPP gas is even hotter.

I like to get it hot, then spray it with PB. Seems to wick it in. Then heat it up again.

Sometimes a whack with a hammer can help jostle a bolt loose.

I've heard acetone and ATF is better than PB. I have a bottle of it in my garage. Not sure if it is actually better or not.

Use 6 point sockets. Good ones will focus the load more on the sides than the corners. Even Harbor Freight ones do this.

Giant breaker bar with a cheater pipe. The longer it is, the more mechanical advantage you have.