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According to everyone above canola oil is the thinnest veg oil and 1095 requires very thin oil. Actually some makers say it should be quenched in brine heated to 130, but from what I've read cracking is sometimes problem with that. There are some real thin hydraulic oils, but I haven't ever heard of them used for quenching. A 200 ton punch press I had had very thin oil, was almost as thin as water, but I don't know the number of it or what it's viscosity was.
Has anyone here ever used hydraulic oil for quenching?
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Now it says Guru and it used to say Master. I think I like Master better, though skilled would be the best description
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