Amsoil ATL (blue cap, low visc) in 2014 Navigator (6r80) since 145,000mi. Now have 174,000 on it towing a 7500lb camper often at 80mph for a significant portion of that mileage. Runs and shifts like a perfect transmission. Honestly, I feel spoiled by how well it does.
2016 Mercedes GL450 with 7g-tronic. Changed to HPL Green CC ATF since its visc most closely matched the MB fluid visc. Changed that at 110,000mi and it’s been great to the now 125,000mi hauling the fam of 6 to wherever around town. Also hauled the fam and our 14ft utility trailer loaded with all of our luggage and two motorcycles from North Alabama to Philly and back. Total load was around 3200lbs worth of trailer. Did the same load from North Alabama to Southeast Alabama as well. This transmission, even before the change to HPL, was simply never as smooth as the 6r80, however, its improved over the miles of our ownership, so perhaps the TCM has been learning shift patterns to compensate.