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KOSHIE1's Photo KOSHIE1 Posts: 13,257
9/18/18 3:22 P

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food science minor here.... yes it is true. But to answer your question, it is generally safe to re-use your oil many times. How many times depends on the oil you choose to use, and if you heat it to the smoking point (now you ruined it! Toss it!) or not. It also depends on how long you've had the oil, its storage conditions, etc. Like do you strain it after each use? Is it stored airtight? Is it stored in a container that the oil fills to the top? (yes are the right answers here.)
Toss rancid oil.
So, there is no easy answer for you, sorry. Do your research about which oil you choose to fit your needs, and then store it well and don't over-heat it and you can get 2 weeks or more daily use out of it! Peanut oil and palm oil and coconut oil are VERY stable (good choices for re-use) but very expensive. I use my peanut oil to deep-fry holiday turkeys and it gets used 6-8 times over an 18 month period and strained and stored airtight in the fridge -- then it gets tossed because I start to worry about how old it is. (every time I strain it I make gravy with the drippings!) Olive oil? That has a low smoking point (it burns at a low temperature) and it is expensive so it isn't a good frying oil choice unless you have money to burn! Vegetable oil? I'd use that 4-5 times and toss it at the end of the month.

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7/14/18 11:06 P

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I wasn't completely sure on this, but doing a quick Google search, it appears that it may be true. I found a few articles that discuss that and a little more here:

Coach Denise

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7/12/18 12:48 A

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Chemistry suggests that repeated heating up of oil could release harmful substances... is that true?

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