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Found this to be an interesting article, on what to use to break loose those rusted nuts and bolts. "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 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 20% of the price.ATF/Acetone mix is best, but you can also use ATF and lacquer thinner in a 50/50 mix. ATF = Any type of Automatic Transmission Fluid.

This version of the story was in one of the Military Vehicle Club newsletters
 

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I guess WD-40 isn't the best penetrating liquid for loosening rusted fasteners.

I should have used that 50:50 mix of ATF and acetone to remove the fog lights on my rust bucket Outback, friggin fog light studs broke off thanks to Michigan rust (don't buy a car from Michigan!)

Thanks for sharing, this'll be helpful for removing more stuck fasteners off my rust bucket Outback.
 

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Since acetone eats paint. I suggest to try the ATF and lacquer thinner in a 50/50 mix. http://www.grainger.com/product/WESTWARD-Oil-Can-1EKE7?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/1EKE7_AS01?$smthumb$
 

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Lacquer thinner is used to remove paint as well.........

WD40 is great at advertising, they product however is sub par. I use PB at home for just about everything as it breaks the rust up well. when I have broken down and rebuilt turbos I did run straight for the ATF, but in general I get the job done with PB and it is convenient and easy to work with. It also doesn't leave the mess Liquid wrench and ATF leave behind.
 
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