We are at high altitude with a basement that is cool to COLD year ’round. Barely above freezing in winter….so that’s an advantage a lot of folks don’t have. I’ve had great luck with olive oil….in small bottles so there isn’t a lot of time exposed to air. We have some Crisco, which seems to survive anything. No longer made from cotton seed pressing…. We have lard stored also. Other oils we just rotate and have never had any of them rancid. Do not eat rancid oils….they are toxic.
OldMtWoman