Best Penetrating Oil for Rusted Automotive Fasteners?

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Maybe the grease was getting dry and the kroil "re-wetted" it. I've done this before on light applications with Triflow and it has worked very well!
 
wouldn't a thin MT fluid work even better than ATF when combined with acetone? the viscosity of about 6-7 cst is more or less the same, but the Phosphor content is likely higher?
 
Originally Posted By: Toaster_Jer
Took a while to find it.

http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4012336/How_to_apply_ATF/Acetone_antis

Note also that “Liquid Wrench” is almost as good as “Kroil” for about 20% of the price.

Machinist’s Workshop Mag™ recently published some information on various penetrating oils that I found very interesting. Some of you might appreciate this. The magazine reports they tested penetrates for break out torque on rusted nuts.
They are below, as forwarded by an ex-student and professional machinist. They arranged a subjective test of all the popular penetrates 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.
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 about 20% of the price.
Steve from Godwin-Singer says that ATF-Acetone mix is the best and you can also use ATF- lacquer
thinner 50 - 50 mix

Looks like the same list the American blacksmiths guild did a few years ago
 
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