Our lab tech sent this to me in an email. I'm posting it for the information, I have no idea if it's right:"".
Penetrating Oils
Machinist's Workshop Mag recently published some information on
various penetrating oils that I found very interesting. Some of you
might appreciate this. The magazine reports they tested penetrates 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
penetrates 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 almost as good as "Kroil" for about
20% of the price.
Steve from Godwin-Singer says that ATF-Acetone mix is the best and you
can also use ATF- lacquer thinner 50 - 50 mix.
ATF=Automatic Transmission Fluid