Is it permissible to eat foods fried (such as chicken or potatoes) in oil that was used to fry haram meats (such as pork), in order to save money and not change the oil until after frying more than one meal?

The jurists have unanimously agreed on the impurity of pork, based on the Almighty's saying: "for indeed, it is a defilement (Rijss)." Therefore, if pork is fried in oil, the oil and the food fried with it become impure. The Prophet, peace and blessings be upon him, commanded that pots containing the meat of forbidden domesticated donkeys be overturned, and pork is even more deserving of this treatment. It is not permissible to use utensils in which forbidden things have been cooked except after washing them. So, if you are certain that the oil has been changed and the pot has been washed, then it is permissible to eat theful things fried therein.