I have a 6 gallon can with about 5 gallons of used oil from a fast food restaruant. I have had it for 3 years and it isn't rancid yet. I do my quenching outside and keep the lid handy in case of a fire. I also keep my hands and other body parts off to the side of the can when I am quenching for the same reason. The only drawback I have found from using oil from a seafood place to quench blades is that every time I draw my knife, every cat in the neighborhood shows up.
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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