With seven cars, it doesn’t make sense to use seven different oils…
But the reason for many different oils in my case is that I built quite a stash when things were a great price.
So, I am working through the stash.
I could make it simple and run Mobil 1 0W40 in everything. I am sure it would work well.
The Packard would love it, too, despite what some say about classic cars. It has a roller cam, by the way, because in 1932, that was standard on a Packard. Lesser makes used the cheaper flat tappets well into the 1980s. So, no, Zinc isn’t big concern for that car, but fuel dilution from an updraft carburetor sure is.
I will probably settle down on 3 oils - one for the V-12s and the R. One for the Packard (cheaper, because it will get changed every year) and one for the other two Volvos and the Tundra.