Cider vinegar. I use my torch to heat up the nut but that didn't work
> either. Any viable help will be appreciated.
water will dissolve rust oil will not
since you sprayed oil first and then torched it the oil should be gone but if not adding vinegar or water will not now penetrate
make sure to burn off all the oil but do not heat up too much if the threads are exposed wire brush them
then use the purest water you have and soak that nut well
then make sure and loosen in the correct direction