Despite ZF looking to selling parts (everywhere) and service (they have service shops in some areas of the world), I find it interesting to see their perspective on oil change interval versus one of their customers (BMW).
"Depending on the driving style, ZF therefore recommends a transmission oil change every 80,000 to 120,000 km, or after 8 years at the latest".
80,000 km = 49,708 miles.
I've also uploaded my Blackstone results for reference, in case someone else has results to compare.
