I can only imagine how many oil questions have been asked. I have done more then a few searches. The problem comes in when a friend of mine asks me to make a fillet knife for him. Ok,,, Fine. lol,,, I had a piece of 15n20 about .065 thick. Got it shaped out at the end of the evening. Oh,,, I forgot to say I have never made a knife that thin. I did a Google about heat treating and came across a thread about using veggie oil for a fillet knife. You should not use "normal" oil. Like old motor oil and tranny oil. So what do you think. Will he grow anteni if I quench in my oil or should I go get a few gallons of veggie oil?