Changing my transfer case fluid in my 2015 MDX SH-AWD. My notes from the last time I did it was that it takes 3 pints of HGO1 GL-5 80w-90 gear oil. Since there is a Honda dealership nearby, I went in to get some there, and they came out with 75w-85.
When I got home, I called the local Acura dealership on the other end of town, and they confirmed that it should take 80w-90, but he said they don't sell it by bottles (service department has big drums of it though). So after some digging, I recalled that I bought it last time from Bernardi Parts online. So I went there, and they only show 75w-85 (don't even sell 80w-90). Searched some more and I literally can not locate anyone that sells Genuine Acura HGO1 GL-5 80w-90. Did Honda/Acura change the specs on this? Is 75w-85 acceptable replacement?

 

All I can derive from My search is lower viscosity for fuel efficiency.

 

And less gear box friction protection?