Thread: Loosening Rusted Parts.

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Got this from my Step Son and thought it was worth sharing.


“Machinist’s Workshop” recently published information on various penetrating oils. The magazine reports they tested these products for break out “torque” on rusted nuts and bolts. A subjective test was made of popular penetrating oils, with the unit of merit being the torque required to remove the nut from a “scientifically rusted” bolt. Average torque load to loosen nut:

No Oil used ……………………516 foot pounds
WD-40 ………………… ……..238 foot pounds
PB Blaster …………………….214 foot pounds
Liquid Wrench ………………….127 foot pounds
Kano Kroil …………………….106 foot pounds
ATF/Acetone mix…………………. 53 foot pounds
The ATF/Acetone mix is a “home brew” mix of 50/50 automatic transmission fluid and acetone. Note this “home brew” released bolts better than anycommercial 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 20% of the price. ATF/Acetone mix is best, but you can also use ATF and lacquer thinner in a50/50 mix. ATF = Any type of Automatic Transmission Fluid.
This version of the story was in one of the Military Vehicle Club newsletters

I've been using the ATF/Acetone home brew for at least a decade.. I get the ATF from a friend at a tranny shop I use to work at. I just get a cheap acetone from lowes or home cheapo..