So maybe someone can answer why the OEM would recomend ATF, but BG and Amsoil recommend gear lube. There pretty different no?
I have a reason to ask. I own a 2008 Nissan with 395K miles and a 2011 Nissan with 170K miles, both owned since new, with the same old school locking transfer case - no limited slip clutch anything - some gears and a chain. They both spec Matic D, which as best I can tell is pretty much Dex 3. Both use Matic S in the trans, which was the then Nissan ATF when built, and I think its pretty close to Dex6, so it was always odd they just didn't spec Matic S.
I have used Matic D, Matic S, Castrol Transmax that claims to meet Matic D specs, and Maxlife - which also claims to meet spec. I have never had a problem with either case, but they do sometimes struggle to come back out of gear. I assumed it was age and me not using them enough, but honestly for both it both started happening once it was just past warranty, when I started not using Matic D, and neither has gotten much worse.
I am tempted to pour matic D in and see what happens?