Gil Russell, from Arizona, a fellow double gun nut, and a good guy, posted the info below on another forum. I think it should be of interest to any tinkerer and took it upon myself to copy and paste it to this forum. I already have acetone in my shop and I'll be sure to grab a pint of Dexron tommorrow!

Machinist's Workshop Mag (tm)recently published some information on various penetrating oils that I found very interesting. Some of you might appreciate this. the magazine reports they tested penetrants for break out torque on rusted nuts.
They are below, as forwarded by an ex-student and professional
machinist.
They arranged a subjective test of all the popular penetrants
with the control being the torque required to remove the nut from
a "scientifically rusted" environment.
*Penetrating oil ..... Average load*
None ...................... 516 pounds
WD-40 ..................... 238 pounds
PB Blaster ................ 214 pounds
Liquid Wrench ............. 127 pounds
Kano Kroil ................ 106 pounds
ATF-Acetone mix..............53 pounds
The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic
transmission fluid and acetone. Note the "home brew" was better
than any commercial product in this one particular test.
Our local machinist group mixed up a batch and we all now use
it with equally good results.
Note also that "Liquid Wrench" is about as good as "Kroil" for
about 20% of the price.
For further information:
http://forums.thecarlounge.net/zerothread?id=4547049