I posted on this on an old thread years back but likely to get lost in a middle of maintenance thread. I believe something that Gen 1 CX-5 AWDs should proactively address even if you don't off-road and use a carwash.
mazdas247.com
mazdas247.com
2013~2016: - CX-5 Rear Diff and Transfer Case Fluid Change: Tools, Parts and Links
I would ask what the viscosity will tell you or what path of research you are headed down? Andnope, no one on the internet's most busy oil forum have not chimed in. https://www.bobistheoilguy.com/forums/threads/mazda-long-life-hypoid-gear-oil-sg1.291007/post-4784389 And I would caution of...
2013~2016: - CX-5 Rear Diff and Transfer Case Fluid Change: Tools, Parts and Links
Part showed up for rear diff water intrusion issue I posted in a few back here https://mazdas247.com/forum/t/rear-diff-and-transfer-case-fluid-change-tools-parts-and-links.123850370/post-6743712 Sorry... terrible pics... probably won't get to this until January though. Not sure if everyone...