This information has been posted on numerous bulletin boards and passed around in emails for a long time and somehow I keep deleting it every time I see it. Well, no more. I’m posting it here so I can see it and anyone else who is interested in it can as well.
Penetrating Oils Compared
Machinist’s Workshop magazine actually tested penetrants for break out torque on rusted nuts. 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.
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. A local machinist group mixed up a batch and 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.
I’ll be testing out some Liquid Wrench and PB Blaster and maybe even the home-brew ATF-Acetone mix in the near future since I’ll be trying to remove the exhaust system from my 911 in the near future. Can you say 24+ years of dirt, grime, and maybe a little rust on them there exhaust nuts? If we go by how bad the stuff is for you, I’m not surprised the ATF-Acetone mix is #1.