The harsh truth is people way over think oil. Many test it but really have little clue what it means. Most can’t give you an answer for what the rating on the bottle means etc. Many are just so obsessed of out miles and time on oil.
I worked in a bad part of town where I saw old and new cars subjected to things we here would cringe to see. First oil changes at nearly 80,000 miles.....Yes! 80,000.
Now I am in no way endorsing abuse but I have been there and seen things most could never imagine and engine come out and still live long fruitful lives.
There are some cases where some equipment needs special attention but most never did. Today things in new cars are getting more critical due to the many things oil does today beyond just lubrication.
But in old cars from the 50’s to around 2000 most easily could deal with a lot of issues and live on. I have seen engines come out of cars burned up in fires and run. Saw one filled with gear oil and live a long life. Seen many with oil changes over 20,000 miles and easily out live the rust on the car.
Saw one driven several miles with no oil and live. Slant 6 mopsrs were hard to kill.
Much on lil life in storage is due to conditions. If you are not in a climate controlled area moisture is the real issue no matter the oil. If you do not run it Long enough the moisture builds up. In the spring as temps rise moisture builds on cold metal inside and out.
Now if you have controlled temps you eliminate this moisture issue and generally it is not an issue. Use a hood oil and you can extend the life.
The greatest danger today is the lack of phosphorus and zinc to flat tapped cams. There are still some oils but you need to read web sites to find content.
I have always said the three things to avoid in conversation is Politics, Religion and Oil. I even had two customers get in a fight over oil till the one left yo come back after the other customer left. The funny thing was neither had a clue about oils but they were willing to fight for it.
Life is never boring.
One last thing. Todays cars are more critical about oil. The trouble is so few understand how. Oil today adjust cam timing. Cools and lubes turbo bearings. Cools pistons, deals with killing cylinders and in some cases more. Some oils can kill converters and sensors in modern cars. The light piston rings will use some oil and if the oil is not approved for the sensors you can lose them.
These new approvals like Dexos etc are due to these new needs. Many 5hink it is just to raise money but the truth is automakers have special needs and these ratings force oil makers to meet these needs.
Might note I have also gotten several poorly stored barn finds back on the road with no drama. One suffered stuck valves but a little Marvel Mystery oil and it solved the issue. A trick I learned from being around old car guys who had a lot of real world experience.