I would by new in a smaller bottle for your use, as I do. That oil is old and if it isn't spoiled, will be soon. Your and families health is not worth it. If you want use it to fry something, it maybe OK, as the heat will kill some of the bad things in it. Don't use it at room temp. over a salad etc. Buy a new bottle and compare the tastes, you will get rid of it. Be safe, if in doubt, throw it out.