HI guys,
I have been lurking around here for awhile reading interesting posts
and gaining knowledge.

My question is, what is the "proper" type of oil for heat treating and
hardening small punches and buttons and so on. I have had a machinest
at work tell me "you want to use a high sulfur based oil".(- All I
know is when I used a high sulfur based oil to harden with it STUNK
like you know what!?) So, I guess what I'm asking is, what type of oil
is the correct oil? Can motor oil be used? Thanks, Tracy