Found some old Zippo Lighter Fluid at home but I could not find any best before date. I think it is somewhere between 15-20 years old (new box to the right). Safe to use or should I buy new fluid?
I know that normal gasoline lasts about six months and fuel-stabilized gasoline keeps for one to three years.
According to this thread however there's nothing in lighter fluid (naphtha) that can go bad.