One basic thing to remember about olive oil is that it is constantly oxidizing as a result of age, heat, air and light exposure. Always store olive oil in a dark glass bottle or stainless steel container. Do not store in plastic bottles because olive oil is very reactive and if in contact with plastic will take on the properties of the plastic container. Place the container in dark places and in areas that are slightly cooler than room temperature. Tightly close the container when you are not using it. Always check the date on the bottle and don't buy oil, which has been bottled for more than 9 months. Do not refrigerate olive oil, the condensation can mix with the oil and make the final result less flavorable.
I hope this will help you.