RE: So...? Actually, the main reason they use deisel fuel is because it is one of the cheapest lubricants on the market, and is very easy to supply...
The reason I used the term porous was only because it saved me an explanation that i assumed most people could conclude on their own - salt rock is not pure salt, it does however, have soluble materials in it (and not just by water). If a liquid is sitting against it for an extended period of time the soluble material will erode off the non-soluble part, creating a pitted and therefore weakened rock.
If you put a piece of rock salt in a gallon of oil and add pressure to the container, then leave it for a couple hundred thousand years and then go back for a looksy, you should find a rock in the bottom that looks like it belongs in your bbq.
If you truly think that only flowing water can absorb salt, then I suggest that you talk to the guys that clean/service steel items, most of them use muratic acid to clean salt stains... not water.
My suggestion is sell your nog. I'll buy it.