Smell test!

Cooking oil can be used in oil lamps, if you are really concerned about what to do with it. If your power goes off and you want a light, you can use oil lamps for many hours. A bottle of vegetable oil will burn for a long time. I understand that olive oil is better than most vegetable oils for burning. I haven't tried it, but it's an idea rather than wasting it by throwing it away.

It’s unusable
 

I’ve spent 46 years in the wholesale restaurant supply business and I can tell you for sure if it is 2 years out of date it will smell and taste rancid. Will it hurt you? Probably not. But anything you add it to or cook in it will end up in the trash. Don’t ruin whatever you’re cooking. Dump it.

I like the add to soil response; I never heard that and it makes good sense to me.
Thanks

I googled it awhile back coz I had cooking oil dating back 12 years!!! Sorry I didn't keep the source, but was told do NOT pour it down the drain or toilet. Do NOT put it in a recycle bag. Keep it in the plastic jar, sealed, and put it in your garbage bag along with the rest of whatever is in there. They will pick it up and get rid of it. Another option is to pour small amounts in a messy yard where there are no pretty plants or grass. That didn't appeal to me.

Vegetable Oil expired???
 

Their shelf life, however, is quite similar to one another. As long as your vegetable oil is unopened and stored properly, it should be fine for at least two years, probably for a lot longer. Once you'll open the bottle, the oil in it should be fine for at least a year. Olive oil will last another one year!

:bigbow:

If you have a shredder then you can use the shredded paper to soak up all the oil. Then put it in the trash.

Dig hole in your sandy soil, that grows nothing but weeds....Pour in the oil and cover with the soil.. See what happens, you either get a nest of roaches or flowers..

Great lubricant for garbage disposal
If you leave for an extended period pour some down each drain won't evaporate and will keep bugs from coming in through drain pipes

I appreciate your concern about disposing of this properly.. This has happened to us SO MANY TIMES! with regard to our oil, I would just put it somewhere in my yard that I don't want anything to grow, then 'water it down'. Then, rinse the bottle well, with hot water before before recycling the bottle. Thank you for caring! I appreciate you!

Down the drain, it won't clog the pipes & will degrade

Let's start from the beginning
 

The OPs premise appears to be cooking oil is a hazardous, toxic or other regulated waste. It is not.

Hazardous waste is covered under the Resources Conservation Recovery Act (RCRA). Cooking oil is not covered, period. What about the other Major law, the Toxic Substances Control Act (TSCA)? No, that is PCBs only. What about ORM (other regulated materials). Like bbq briquettes (which are regulated), no not covered.

So, you have essentially you have a can of peas. Spray plants, put it on the grass, throw it away, pour it down the drain. The reason it IS NOT regulated is it is harmless in the quantities that an individual posseses.