@oilcan1001 : Back story: I was always reading about T6 and how many people use it, especially here on .ORG. I for one was always a MC 10w30 guy....cause it worked. To better my own knowledge and opinion I made the effort to "drink the Kool-Aid" of sorts. So I set out to get a few oil change intervals worth of T6. It just so happens that the widely available (at the time) containers were 2.5 gallons or 1 gallon containers. I needed 13 qts per change...3 gallons + 1 qt. So I was buying to meet that as well as buy to have more than one oil change....actually planning on buying to run T6 for a calendar year.
So with that I found a few 2.5 gallon containers, along with 1 gallon containers to meet an expected 20-30k worth of driving over 2022. I did notice at that time it was hard to find, but ended up getting what I needed for 2022. It's now just dust on the shelves....I was surprised to find the 2 gallons yesterday....worse is there's NO oil filters for my 6.7L at Wal Marts I have hit.
Not to mention being able to speak to my results (experiences) with T6, I can speak while having experienced more than a single oil product which plenty people tend to do. I don't do oil testing as I feel it's not worth the costs over the long run. Oil testing has it's place, just not a place for people who will routinely change their oil within the intervals most tend to follow of 5k, 7.5k, or even 10k intervals. For the longest time I was a proponent of 7.5k intervals, using a 10k interval as an emergency situation back up.
BTW if you want some T6 I know a guy.....LOL