A post recently made reminded me ofthis test I posted on iBoats several years ago. I was able to find itand thought I would share it here.


Machinist's Workshop magazine actuallytested penetrants for break out torque on rusted nuts withsignificant results.


They arranged a subjective test of allthe popular penetrants with the control being the torque required toremove the nut from a “scientifically rusted” environment.


Here are the results


Penetrating oil Average load
None--------------------516 lbs
WD-40------------------238 lbs
PB Blaster--------------214 lbs
Liquid Wrench---------127 lbs
Kano Kroil--------------106 lbs
ATF-Acetone mix------53 lbs*


* The ATF-Acetone mix was a “homeBrew” of 50-50 automatic transmission fluid and acetone.