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.
In 2016, Mazda changed the recommendation for the transfer case and rear differential on the CX-5 from an 80w90 GL-5 to Mazda Long Life Hypoid Gear Oil SG1. Anyone have any technical data on this Mazda OE fluid?www.bobistheoilguy.com
And I would caution of relying on viscosity as a measure of compatible oil.
Gears make the world go round, but without lubricants they’d exist only in passing. Whether in heavy industrial machinery or in the crankcase of your vehicle, these oils allow gears to slide along smoothly by preventing surface friction from wearing them down. Let's dive into our ultimate gear...recondoil.com
seriously just buy the required SG1 - there are SO many threads to find a less expensive alternative.. but the magic blend simply is not replaceable by an alternative currently.
My 2016 CX-5 AWD is going to be shortly up for these 2 oil changes. I went thru various posts and confused. 1. What's the oil to purchase? Older generation seems to have 80W-90 whereas starting mine its Hypoid SG1. Try as I might but finding it very difficult to get hold of this long-life...mazdas247.com
I'm just curious since there is no indication of what grade of fluid it is and previously, the dealer used 0000-77-80W9-QT (SAE 80W-90 R DIFF OIL) in my vehicle. So for curiosity sake, is SG1 a higher grade or a lower grade fluid and why isn't Mazda listing it on the bottle? Must be some secret sauce if they aren't willing to tell people.
I don't have any plans on using other 3rd party alternatives since there's no need but my rear diff/transfer case maintenance seems to be coming up soon. I had it changed by the dealer at 42k miles and now I'm at 64.5k so I guess at around 72k is when I should service it as I do repeated trips of <10 miles.
Also, since this guy posted his analysis for 80W-90, I'm planning to also send in mine as well for a comparison. In addition, I'm planning to send a sample of SG1 as I do not see any results on BITOG or on this forum so far.
2014 CX-5 Transfer Case & Differential fluid change and analysis