How long does oil keep?

i strain through a paper towel, using a funnel back into a big jug. I use indefinitely and just keep adding new. keep it in a cool place, never had a problem or a bad taste.

i keep mine in the pantry, but, fridge would probably be better, if you have the room...

vegetable oil once opened is good for aprox four to six months.

Olive & peanut oil will keep for about 6 months in a cool, dark pantry, but up to a year in the refrigerator. It may become cloudy and thicken up in the cold, if so let it warm up to room temp so it will pour.

Ask BP

Another true story about my ditzy wife.
I told ya'll about how after we got married it was time to sell her house and salvage whatever stuff in her kitchen I could use.
I got down on the floor to see what was in the very back of the lowest kitchen cabinet. I spotted a Fry Daddy so I reached and grabbed it be the handle and started to pull it out. When it tilted rancid oil came spilling out.

Me: "Why is this Fry Daddy full of oil?"
Wife: "Someone told me you could reuse oil."
Me: "When did you last fry something in this?"
Wife: "About 3 years ago."

im sure your wife is a wonderful woman, but i have this very distorted image of her based on a handful of stories that you have told about her. keep them coming though. quite entertaining