Quote Originally Posted by John Koehrer View Post
Drying out the lube? There may be some trace amount of water in it but really? Properly lubricated machines don't rust.
Indeed not.
But in lubricated machines that aren't used, the lubricants do turn hard (which you may call "dry out"), and the entire machine needs cleaning and relubrication before it can be used again.

They harden, not because water evaporates (and would be absorb by Silica gel - the gel does not extract moisture, merely absorbs it), but because the stuff itself changes over time. Lubricants age, and do that faster when left alone.