Effectiveness of Penetrating Oils

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.

2 thoughts on “Effectiveness of Penetrating Oils

  1. Cool, let me know if it works for you. I’ve used PB Blaster and Liquid Wrench and know they work pretty well after soaking bolts in it for a few days. I wanted to find Kano Kroil but I’ve had no luck finding it. I should have mixed up ATF-Acetone since I have them in the garage, but, I didn’t since I wanted to get rid of the PB Blaster I had sitting around.

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