Old time oil cross reference

Would any of you through your archives have the ability to cross reference old oil names to a contemporary oil weight?

Zerolene Triple B or Zerolene A

Can't give a cross over but this may help http://www.bobistheoilguy.com/

[quote="Dunefanatic"]Would any of you through your archives have the ability to cross reference old oil names to a contemporary oil weight?

Zerolene Triple B or Zerolene A[/quote]

Zerolene is a tradename used by Standard Oil Company of California backin the 1930s.

I do not have a reference to the triple B or A in the "Oils recommended by Oil Refiners and Distributors for Use in Caterpillar Tractors" Form SL 1825 though. What piece of machinery is this called out for and what application?