Since my father was not into car work, although he was pretty good at fixing the household plumbing, drains and electrics, the cars got whatever the garage used.
Since then as now cars often leaked or used oil, we always had a few quarts on hand, originally in metal cans.
Brand was just a matter of whatever current API spec oil the local discount store had.
At the time, we had Uncle Bill's, so whatever Uncle Bill's had cheaply is what we used.
Oil then was incredibly cheap by current standards. Of course, fuel was as well. I remember my mother thinking that it was awful when fuel hit fifty cents a gallon.
.29/qt was a typical sale price with no MIR needed and you could buy Citgo for that on sale at Kmart on a regular basis as late as the early eighties.