My experience has been that there is so little "long term" ingredients in it, that for 99.99% of the purposes, it might as well not be there.
Why go to Wikipedia to read what someone else says about the MSDS?
http://www.wd40company.com/files/pdf/msds-wd494716385.pdf
I've seen hinges destroyed with it, because it washed out the original grease and what it left was insufficient. I've seen rotating bearings destroyed for the same reason. I've seen potentiometers and switches ruined by it.
It has its uses. But in my experience, it sucks as a lubricant except only temporarily.