https://www.napaonline.com/en/p/NHF65201 This is what's reccomended for anything with br*** internal parts. Maybe not only NAPA brand but it's what I've been using.
I have BW259 with the R10 overdrive (little brother to the T85 R11) and I have been using Tractor Supply Transmission Gear Mineral Oil with a lot of success:https://www.tractorsupply.com/tsc/product/traveller-ford-tractor-hydraulic-oil-2-gal-t806600