What does oil taste/smell like when it goes rancid?

Question

I heard that oil can expire by "going rancid." How do you know? What does it taste/smell like?

Answer 1

It's hard to describe, but it will be unmistakable. It will have a really strong, nasty smell and taste, kind of sharp and bitter, like when you have a batch of fries from a fast food place that were fried in old fat.

Answer 2

Bad olive oil smells like oil paint.

Answer 3

it doe,s not go bad it,s the stuff you cook in it that ruins it i,ve had crisco get bugs in it