Here is some info I dug up in 2011 on testing. Penetrating oils tested
http://chainsawrepair.createaforum.com/tools/penetrating-oils-tested/Copy pasted 1st post from thread.
Does this sound right to you guys?
Machinist's Workshop magazine tested penetrants for break out torque on rusted nuts with significant results!
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 (obviously a BIG nut!).
Penetrating oil ...... Average torque
None ....................... 516 ft lbs
WD-40 ................... 238 ft lbs
PB Blaster .............. 214 ft lbs
Liquid Wrench ..... 127 ft lbs
Kano Kroil ............. 106 ft lbs
ATF-Acetone mix....53 ft lbs
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 machinistgroup 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.
Another method to try when 'nothing works' is to heat the nut up with a torch to almost red hot, apply Bee's Wax to the threads and base of the nut, let it sit for about 30 min then remove the nut. If this doesn't work, get a nut cracker or a hacksaw ! A trick I learned from Dugan that had been around and passed it on to us. We used this method to remove big safety valve nuts that had not been removed for almost 24 years when nothing else worked. BO
Happy knuckle busting !
Copy and pasted from a email my dad sent me.