I don't usually post about any kind of oil, engine or penetrating
But this stuff is too good not to tell others about. I've been a big fan of Kroil for years, but after breaking off an exhaust stud in my 1966 300 convertable, I was looking for help to get the broken stud out. I stumbled across this stuff using a search engine. It really does melt rust. A few applications about 15 min apart does the trick on even the most rusty bolt threads.
P. S. Don't tell me you've been using it for years unless you got a good reason why you didn't tell me about it before now.
P. P. S. It's cheap too Oo.
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http://www.supco.com/Chemicals%20pg7.htm#RustBuster

But this stuff is too good not to tell others about. I've been a big fan of Kroil for years, but after breaking off an exhaust stud in my 1966 300 convertable, I was looking for help to get the broken stud out. I stumbled across this stuff using a search engine. It really does melt rust. A few applications about 15 min apart does the trick on even the most rusty bolt threads.
P. S. Don't tell me you've been using it for years unless you got a good reason why you didn't tell me about it before now.

P. P. S. It's cheap too Oo.

http://www.supco.com/Chemicals%20pg7.htm#RustBuster