[Vintage-race] What Oil Do You Use?

[Norm 2Bs]

I had a conversation recently with a guy who insists that vintage racers do
NOT use synthetic oil.  I told him, in that case, I must have been racing
newer cars as I have been using synthetic oil in my vintage racers since
1999 once the engines have been broken-in.  But, he is adamant that we ONLY
use petroleum-based oils.
 
What do you folks on the Digest use?
 
Norm Sippel
'59 Turner
'60 Alfa