On an earlier but now inactive thead. people have mentioned the wonders of Coca Cola and white vinegar for loosening rusted bolts. Some people say, though, that with largish bols/nuts that are corroded together that applying oxy-acetylene heat to the nut - enough to get it glowing cherry red, at least - is a good way. The idea is, it will expand the nut (which absorbs the heat first, before very much heat has transfered to the bolt). Then they say you can loosen (unscrew) the nut with a socket wrench. Has anyone here tried that method? How would you compare it with the use of vinegar, Coke, or penetrating oil? Assuming you have the torch kit to resort to, what are the advantages, disadvantages of this method compared with the others?