3-in-1 oil used on Ives and Lionel tinplate in my family from 1924 to 2008.
The smell of 3-in-1 is part of the tinplate experience.
Now, I use this
http://www.ebay.com/itm/Liquid...;hash=item4cf222729f
mostly because of the very convenient tip puts the oil where you want it, and the slightly thicker viscosity keeps it there.