For those of us.. who actually need info like this from time to time..
Read below…
From what I could track down.. this is probably the origin of the information…
http://bbs.homeshopmachinist.net/threads/47279-Penetrating-Oilother searches…
http://www.google.com/search?q=machinist+workshop+article+%2B+penetrating+oils&sourceid=ie7&rls=com.microsoft:en-us:IE-Address&ie=&oe=http://www.google.com/search?q=atf+acetone+mix+%2B+rusted+bolts&sourceid=ie7&rls=com.microsoft:en-us:IE-Address&ie=&oe=Penetrating Oils
Machinist's Workshop recently published some information on various penetrating oils. The magazine reports they tested penetrates for break out torque on rusted nuts. A subjective test was made of all the popular penetrates, with the control being the torque required to remove the nut from a "scientifically rusted" environment.
Average torque load to loosen:
No Oil used ................... 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 is a "home brew" mix of 50 - 50 automatic transmission fluid and acetone. Note this "home brew" released bolts 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 almost as good as Kroil for 20% of the price.
ATF-Acetone mix is best, but you can also use ATF and lacquer thinner in a 50-50 mix. (ATF=Automatic Transmission Fluid)