This car is not the only vehicle using my oil. I also have a truck takes 5w30, I take care of my sisters SUV, my mothers SUV, truck, and JD Gator. All take 5w30, so I figure I've got three to four years worth of oil remaining quick arithmetic, as my mother and sister take 3-4 oil changes a year (mother drives 40k miles/yr going to grandkids things).
I think I purchased the 5w30 for $2.75 on closeout at my employer in 2021 before the manufacturer did a label change and marketing update to increase retail price $2 (formulation stayed the same). I don't know how these things work, but I assume the manufacturer wanted to start using the new name and so gave a rebate on the old label under the old branding remaining on the shelf and in the warehouse. I saw the email that the retail price was dropping and the cost to get it in at my store was dropping so I wrote a check and bought the warehouse out of what had not already been grabbed, got it to my store, and made my store a little chunk, and saved myself a chunk.
Stockpiling large amounts of engine oil is not a prepping strategy I wouldn't think, unless you're going to stockpile crude and own your own refinery to make your own fuel, because I don't see a horde of gas staying good for more than two years assuming that can even be done. If I'm not mistaken, stabilizers claim 6-months gain. Two years is me assuming there could be some even better method out there that I'm not aware of.