Oil used for deep frying should be replaced after three uses, if not sooner. For best results, allow it to cool after frying, strain it back into an airtight container through cheesecloth or a coffee filter, and store in a cool, dark place. Repeated heating degrades the oil, so make certain to discard it if it imparts an off flavor to food.
Replace oil for deep frying with:
Your preferred high-heat-tolerant oil, such as peanut or canola.