I used Mobil 5000 with a Motorcraft filter in my old 2000 Expedition with a 5.4 2 valve the whole time I had it. Got rid of it with 170k on the clock in 2010 after having exactly zero power train issues.Lowest tier oil I've used is probably supertech conventional, back when they still made such an oil.
I've also used Quaker State green bottle which at the time wasn't much more expensive and also occupied bottom shelf real estate.
Also used to use a bit of the Mobil Super 5000 product. Wish it was still available at local Walmart.
It met the standards of the time and I rarely went much over a 5k mile OCI because it spent a fair amount of time in city driving.