I think the post meant a 0.6% reduction from the standard max of 1% SA allowed.
https://buy.chevronlubricants.com/en/Product-Category/Motor-Oil/Delo-600-ADF-SAE-10W-30/p/257010388
I also used Torco RTF in my 2006 Ram with the g56 transmission. No problems in over 100k miles. The transmission shifted better and ran cooler to the touch than the oem ATF.
I just purchased a 5 gallon pail from Suncoast Resources out of Houston. They have a local distributor so I didn’t have to pay shipping.
It was $28.33 per gallon.
I also use Torco RTF. I have a 2006 2500 CTD and switched to this at 59,000 miles. I have changed it once at 100,000 miles. The truck now has a little over 140,000 miles on it with no issues.