Richard:
I would think that the viscosity of the oil would be more of a factor than what type of oil it is. The thinner the oil the quicker it will quench the metal. The more viscous oils like 90 weight gear lube would tend to be a slower quench than say a 10 weight oil. A lot of people swear by ATF which is pure petroleum based oil without a lot of addatives. A lot of people advise that you shy away from motor oils because of the addatives that are in them which can have a toxic effect on the body when vaporized by the hot metal. I use used vegetable oil from a fast food joint because it is free and it works for me. You will have to expiriment a little and see what works for you. Take note of exactly what you do and record the conditions that way when you get the desired result, you can duplicte the process.
Woody
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Never try to teach a pig to sing, it wastes your time and annoys the pig.
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