**Jim**- Perhaps this should be a stickie post ...

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FWIW

**the best penetrating oil one can use**is a DIY homemade mix of 50% acetone and 50% automatic transmission fluid (ATF).

Recently “

__Machinist Workshop Magazine__” did a test on penetrating oils. Using nuts and bolts that they ‘scientifically rusted’ to a uniform degree by soaking in salt water, they then tested the break-out torque required to loosen the nuts. They treated the nuts with a variety of penetrants and measured the torque required to loosen them.

This is what they came up with:

- Nothing: 516 lbs
- WD-40: 238 lbs
- PB Blaster: 214 lbs
- Liquid Wrench: 127 lbs
- Kano Kroil: 106 lbs
- ATF/Acetone mix (50/50 mix): 50 lbs