"In a published article in Machinist Workshop Magazine, they tested some commercially available penetrating oils on a group of nuts and bolts they had scientifically rusted to a uniform degree in a saltwater solution.
The fasteners were treated with a variety of commercially available penetrants, and the measured torque required to loosen them was recorded.
The breakout torque required for:
Nothing = 516 ft. lbs.
WD-40 = 238 ft. lbs.
PB Blaster = 214 ft. lbs.
Liquid Wrench = 127 ft. lbs.
Kano Kroil = 106 ft. lbs.
50/50 blend of ATF and Acetone