Transmission fluid plus acetone is excellent for seized bolts. I wonder why.
Re:The History of WD-40
by potentialverand on Monday March 09, 2020 @10:49PM
(#22532326)
Project Farm tested 7 penetrating oils. ATF/Acetone ranked 2nd place above many specifically designed fluids.
I wouldn't use it as a lubricant though past getting seized bolts freed up, but really it's 100% replaced WD-40 for me when working on rusted and old equipment.