Using expired avocado oil is generally not recommended, since it may no longer provide the same level of safety or quality as fresh avocado oil. Avocado oil is a monounsaturated fat and has many health benefits for your heart, brain, skin, and hair. However, this can only be true if the oil is properly stored and used within its expiration date.
When avocado oil expires, it can become more prone to an oxidation process which can reduce some of its beneficial properties. Oxidation occurs when oils are exposed to light, heat units (eg heating to high degrees) or oxygen in the air over time that harm their molecular structure producing free radicals. Free radicals are very reactive chemicals that quickly cause corrosion of other molecules leading to further oxidation damage; resulting in rancidity - a musty smell or taste which renders the product unfit for human consumption through food poisoning occurring due to ingestion of bacteria such as E Coli (Escherichia coli).
Furthermore, prolonged use beyond the expiry date depletes certain antioxidants present in the oil like Vitamin E and polyphenols which may lead to health issues like stroke due to increased risk factors like cholesterol buildup on arterial walls causing plaque formation further increasing chances of artery blockages thereby increasing risk factor towards strokes/heart attack, etc.. Since expired oils lack these natural antioxidants they cannot reverse any oxidative processes already started; thus it won't do much benefit with respect to nutrition either! It's therefore wise not to take any unnecessary risks by using expired avocado oil when there are alternatives available nowadays too such as hemp seed or olive oils both having various secondary health benefits too compared with older cooking fats!