I pretty sure diffs are 75/85 GL4 Hypoid... it is for a 2015...never seen 75/140 listed...I have also seen 75/90 GL5 listed as the spec on mine...Next time I will pick one that says GL4/5 compatible
Although I used ZF tranny fluid till now... next time it’s Ravenol...which is the brand I am now using for the transfer case and diffs...
For info...If you match the spec... with a brand name alternative you can save a lot... stepping beyond the ZF smoke and mirrors.
You may find this useful on tranny fluid specs...which may or maybe not relevant to your vehicle:
https://www.audiworld.com/forums/a8-...truth-2882676/