Posted by MarkB_MI on February 16, 2009 at 18:18:47 from (66.103.227.167):
In Reply to: Penetrating Oil posted by Tom 43 on February 16, 2009 at 14:15:17:
I believe that penetrating oil has its place, but I've never seen it work the magic that some folks ascribe to it. Certainly, if you have an exposed, rusty thread (an exhaust manifold stud, for example), any lubrication helps. But for a fastener with no exposed threads, I have a hard time seeing how penetrating oil is supposed to soak into the threads.
I crack up when I read suggestions to use penetrating oil to loosen spark plugs, drain plugs, or my favorite, pipe plugs. How is oil supposed to get past a gasket or interference fit that is capable of holding oil or air under considerable pressure?
I know what works: Heat works. Get an acetylene torch and try it. You will be amazed. Use a brazing tip for small fasteners, and a cutting tip for the big stuff.
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