How many times can you use the same oil? One thing immediately reveals when it's time to throw it away

TL;DR

Frying oil degrades with each heating cycle, losing its natural properties and potentially becoming harmful.
Used oil can typically be reused two to three times under specific conditions; avoid reusing if food burned or oil became excessively hot.
Food particles like breadcrumbs and flour, high heat, and smoking accelerate oil degradation.
Certain foods like strong-smelling fish or heavily seasoned meats should not be fried in reused oil, as their flavors and smells transfer.
Clear signs that oil needs replacing are changes in color (darkening, cloudiness), a rancid odor, and excessive smoking or foaming when heated.
Oils like sunflower and canola are more stable for frying than olive oil, which burns faster.
To store used oil, let it cool completely, strain it through fine mesh or cheesecloth, and keep it in a sealed glass jar in a cool, dark place.
Never pour used oil down the drain; instead, store it in a plastic bottle and take it to a recycling center or designated collection point.
Different foods, like meat and donuts, should not be fried in the same oil due to flavor and odor transfer.
Strained oil stored properly can last two to three weeks, but refrigerating it can cause it to thicken and become cloudy.

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