Originally, all oil in he US came from Pennsylvania. Later, oil was discovered in Texas and Oklahoma. For a long time, oil was classified as either Pennsylvania crude or Texas crude and people were loyal to one or the other, and both side swore that the crudes were different and their choice was superior. I remember these arguments while hanging around the service station as a teenager.
I lived in California at the time and at that time there were a lot of people from the northeast moving to California ad it did seem that the native west coasters were more likely to favor the Texas crude where the transplanted easterners favored the Pennsylvania crude.
Quaker State was a very popular oil at the time. Later, in the late 60's, the 10w40 oil hit the market. as a new driver with an old car, 55 Chevy, I had tried to use 10w30, but it burned badly so I went back to 30HD for it. I bought a 57 Olds with only 67k miles on it and a fried, who owned the gas station, recommended that I try the new 10w40 as it was not supposed to be as bad about burning. I used it and it did not burn.
I used 10w40 in every vehicle after that until, when hanging around the auto hobby shop on base (Navy) that I noticed that a lot of newer cars, mainly GM cars post 1975 were sludging up badly on 10w40 oil. I remember reading an article in one of the car magazines that I subscribed to at the time about how the VI's in the 10w40 oil caused the oil to sludge at 295° where the GM engines post 1975 ran an oil temperature of around 305°.
Anyway, Quaker State was heavily promoting 10w40 oil and so when the sludging issue came up, they seemed to get the most blame. I don't really know that they were actually any worse than the other brands of 10w40 oil or not, in fact I don't think they were any worse at all.
Times have changed, oils have improved, I guess even the 10w40 oil of today, and engines are better designed so the oil doesn't run quite that hot, but I still will not use 10w40, any brand. I will use Quaker State 10w30, only if it is on sale and is the cheapest oil available at the time. There is so little, if any difference between the brands that I don't see the need to buy anything that is priced higher than the cheapest stuff on the shelf, as long as it meets at least the SL specs.