- Jul 23, 2021
This oil was bought back when a normal case was 12 quarts instead of 6 like lots of oil is sold today. The Versa only takes about 3 qts. 6 oz. per oil change so a case lasts a long while when the car only gets about 12-15K miles annually. I'm still using conventional 10w40 Exxon Superflo in my '97 Ford that I had the in the garage when I bought the car new in Feb. 1998 so it's probably at least 25 years old and still looks and does fine even on 5K mile OCI's. I've never seen any of the older oil that appears to have any type contamination.
So, you have about 37 oil changes stored up for that particular car? Or at 5000 miles per OCI, that's oil for the next 187,000 miles worth of OCIs. Very impressive stash. Given the age, the goal would be to create a reasonable schedule to use it all up so it's not wasted but also so it's at maximum effectiveness.
Given the 25 year age, and since it's conventional oil, I'd probably do quarterly changes, every 3000 miles or so. This give you 8 years of oil changes, making the oil about 30 years old at the end, which would be my (arbitrary) max comfort level for using aged oils. And covers you for oil for the next 112,000 miles. You might even replace 1 qt with 1 qt of a powerful synthetic so you get more cleaning action, with each OCI. That would extend your conventional stash by 30% and create your own "blend." This would extend your stash to about 10 years and 150k miles. Purchase, on clearance or sales, a few 5 qt jugs of the best synthetic and then just work thru those, 1 qt at a time with your conventional oils.
For bi-annual changes you have 16 years of oil changes. As you use up the last of it the oil will be about 40 years old! Personally I'd probably be a bit hesitant to be using 40 year oils in the car, hence the suggestion to use it up doing quarterly OCIs.
[Age old debate, does oil "go bad." I don't know if or when that might occur, but if you handed me a quart of oil from 1970 I would not put it in my vehicle. That would be 51 years. I probably also would not use a quart from 1980, 41 years old. Yes, I know that API standards and processing has changed a lot so in 40 years from today, perhaps I might use a bottle from 2021, theoretically. But at some point, and we all have to find our own comfort levels, it may be less effective or even bad.]