I've seen at least a couple of "experts" opine that for those who aren't happy using gun-specific products, a good quality ATF is a better choice than motor oil.A few years ago after reading about Dexron/ATF I started using it for various tasks,(guns, locks, tools and various and sundry mechanisms in the shop.) It works just as well as CLP for every application I have tried it on.
http://www.grantcunningham.com/lubricants101.html
In addition, Ed (of Ed's Red fame) advised using 50/50 Kerosene & Dexron II, IIe or III ATF as a gun oil.
http://www.handloads.com/articles/default.asp?id=9