These cars are over 10 years old, on UK wet and salted roads it's inevitable you will come across seized fasteners
There isn't one size fits all
Take heat to a nylock nut and you may make the situation worse
However heat and or impact are the most effective
Penatrating oil normally only does anything, once you have already freed the the part slighty or you have access to the back of the fastener
No amout of time soaking will allow the oil to pass through a gap that does not yet exist.
Here I have a salt celler and the top and bottom have seized together
It's only plated, so I can not try too much heat, I have tried a heat gun while the bottom half was wrapped in a wet cloth and that didn’t work, I was going to go over to impact
However as an experiment I will soak in Wd40 for a couple of hours, clean it off with meths and then dismantle even if I end up smashing it apart and see how far if any it's penertrated
Unfortunately I have already clean it a bit to see if it was worth salvaging, but originally there was a green corrosion line around the middle
Here is a brake pipe a did awhile back
Left to soak over night in penetrating oil, worth a shot, nothing to loose
Still needed heating to cherry red
The oil on the threads is from working the union backward and forwards after it was loose
There isn't one size fits all
Take heat to a nylock nut and you may make the situation worse
However heat and or impact are the most effective
Penatrating oil normally only does anything, once you have already freed the the part slighty or you have access to the back of the fastener
No amout of time soaking will allow the oil to pass through a gap that does not yet exist.
Here I have a salt celler and the top and bottom have seized together
It's only plated, so I can not try too much heat, I have tried a heat gun while the bottom half was wrapped in a wet cloth and that didn’t work, I was going to go over to impact
However as an experiment I will soak in Wd40 for a couple of hours, clean it off with meths and then dismantle even if I end up smashing it apart and see how far if any it's penertrated
Unfortunately I have already clean it a bit to see if it was worth salvaging, but originally there was a green corrosion line around the middle
Here is a brake pipe a did awhile back
Left to soak over night in penetrating oil, worth a shot, nothing to loose
Still needed heating to cherry red
The oil on the threads is from working the union backward and forwards after it was loose