23 year old 2-stroke oil?

[Snagglefoot]

I’ve run 19 year old TCW-3. No issues.

 

[daman]

JASO FB is not an obsolete spec. The main difference with FB and FC or FD is the higher levels require less smoke and reduced carbon buildup in the exhaust. FD has more stringent detergent requirements. The lubricity requirements are the same between the three.

Correct, just more detergence. That oil is perfectly good to use!