Isn't ISO-Syn just Chevron marketing department's trade name for high quality base stock oils?
Anyway, ATF is probably the most heavily additized, processed, modified product we use. It's the farthest away from the dinosaur....
I've used Chevron's industrial lubes for over 30 years and never been let down. One time they identified that they'd sold us some mis-labeled turbine oil--right label, wrong blend, and this was a product that they don't stock but blend to order. They came to us, let us know, pumped out all the mixture from our storage tank and replaced it to the original quantity--probably two tank trucks. I've been well satisfied with Chevron products and recently bought a case of their ISO-Syn ATF for a transmission flush.