This is great penetrating oil.  I have a gear box on a rotary cutter that has a pipe plug (screwed in) that needs to be removed to check the proper oil level.  I've never been able to get it off. In fact I usually just stick a piece of wire thru the fill hole to make an estimate of the proper level.  Today, I was looking over the rotary mower and decided to check the gear oil level.  I remembered I bought the Kano Aerokroil oil some time ago (this past July) and decided to give it a try.  I squirted a small amount on.  It just so happened nature called , so I let it penetrate for several minutes.  When I came back, I applied my vise-grips and the plug screwed off like it had never been stuck.  In previous attempts I had used other popular penetrating oils but they did not work.  Like I said, I had given up all hope of getting this plug unscrewed.  So I'm very happy.