It is funny to see that in France, the French Total makes oil for classic cars. There are mono graded oils for very old engines and a multi grade 20W50 for engine made between the 60's and 80's.
I think they have sensed a niche market
These oils are delivered in 5 liter metal cans, and priced accordingly...
Of course no mention of the composition nor the actual content of specific additives, but as they are formulated for old engines, one may think they have the proper additives they require ?