Not sure it will help but I am changing rear diff and front transfer fluid every 25k miles. I’m just using Amsoil and my year (2015) didn’t spec the expensive Mazda rear diff fluid. It is the component on mine I think has highest risk of failure. As stated.. lots of revisions of this hardware.
A lot of potential for cracked ones considering TSB ranges ‘17-‘21
https://mazdas247.com/forum/t/►►►-nhtsa-mazda-cx-5-tsb-listings-brochures-manuals-◄◄◄.123875915/#post-6744952