How do I keep my rubber gasket on my blender container

[no_hypocrisy]

from drying out/not cracking?

Would oil (olive oil, mineral oil, etc.) ruin the rubber or would it help?

Any suggestions please?

[TexasProgresive]

1. Probable those will work OK- I found this site that makes sense.

And I agree with them. Hand wash the gaskets, never in a dishwasher. The temps in a dishwasher are way too high.
https://www.hunker.com/12408966/how-to-keep-rubber-gaskets-from-drying-out

[stopbush]

2. Buy a new gasket.

[mahatmakanejeeves]

3. ArmorAll or equivalent?

http://www.armorall.com/

[no_hypocrisy]

5. Is ArmorAll toxic?

[TexasProgresive]

7. Use the olive oil. Armor all is not for food contact.

[GentryDixon]

6. Do you want to kill your family?

[dixiegrrrrl]

4. If you DO have to replace, or want a spare...

the maker's web site usually can point you to a place to buy
or
if you know the replacement number, ebay and/or amazon usually has them.

I keep the booklets, forms, etc. of kitchen appliances, in a file, so I can re-order if something needs replacing.