I’ve used Redline five times during my 100K miles I’ve logged on my truck. Redline by far is the best oil I’ve used. Best UOA numbers and best no tick sound !!!
In my opinion
I think the Shell Spriax is the sleeper of all the test
It’s cost is low compared to the high end products and it scores very well for daily drivers like the majority of most drivers
I bought it online from Amazon a couple of years ago. But your right it’s hard to find in quart bottles now. It’s pretty easy to find in 5 gallon containers